Second segment wider than long, about equally notched anteriorly and posteriorly, the two sides anchylosed together by a bony bridge, about as wide as the notches are deep.
Fifth segment triangular with deep anterior, triangular notch, a narrow bridge, and short posterior prolongation (the left longer than the right).
Fourth segment in two pieces, with a wide interval between.
Opposite sides of second, third, and fifth segments anchylosed together and those of fourthsegment nearly so.
Fifth segment elongated, left side very much so; the two sides joined by a narrow bridge; posterior notch very deep.
The pterygoids are cut off from the maxillae anteriorly by a very narrow band of the palatine, which connects with a broad band externally and a lanceolate segment internally.
It had a segment bearing the letters of the alphabet and corresponding notches acting as an index.
The brain is shown attached to the first segment at the left.
Each segment of the abdomen has a group of tubercles on a side above the spiracles.
The haven broadened out at its foot and revealed a segment of blue sea.
The head of the caterpillar is supposed to be above, so that the top segment is the eighth.
Side view of the 8th segment in six different varieties.
It is true that individual specimens occur which are entirely green without any black, but these are rare; the majority possess a more or less broad black ring encircling the middle of eachsegment (Pl.
A ring-spot on segments 9 and 8 showing its origin from two shagreen-dots; two red shagreen-dots on segment 7, on segment 6 only one.
The third segment is the largest, the second but half its size, and the first still smaller, and when at rest the two last-mentioned segments are partly withdrawn into the third.
Eye-spots at this last stage; subdorsal much faded, especially on segment 4.
The caterpillars have the full number of prolegs, and, in many genera, carry a prominent dorsal horn on the eighth abdominal segment (fig.
To that part of the world is restricted the allied family of the Hypsidae, distinguished from the "tussocks" by the slender upturned terminal segment of the labial palps and by the development of the maxillae.
The form and direction of the terminal segment of the labial palp afford valuable characters in classification.
The maxillae are developed but their palps are vestigial, while the terminal segment of the labial palp is short and pointed.
In the larva the prolegs on the hindmost segment are sometimes modified into pointed outgrowths which are carried erect when the caterpillar moves about.
The fifth radial nervure does not arise from the third, the maxillae are well developed, but their palps are obsolete; the head is densely clothed with erect scales; the terminal segment of the labial palp is short and obtuse.
In the thorax of the Lepidoptera the foremost segment or prothorax is very small, and not movable on the mesothorax.
The Drepanulidae are an allied family, in which the frenulum is usually present, while the hindmost pair of larval prolegs are absent, their segment being prolonged into a pointed process which is raised up when the caterpillar is at rest.
The larva is remarkable on account of its long feelers, the presence of pairs of jointed prolegs on the first eight abdominal segments, an anal sucker beneath the last segment and bladder-like outgrowths on the cuticle.
We next find one corner of the broad penultimate segment slightly prominent, sometimes furnished with irregular teeth, and against these the terminal segment shuts down.
You see, there is a great deal more difference in the sizes of Alpha universe and Beta universe than in the sizes of these alpha and beta line-segment analogues.
Setae very rarely absent (genus Achaeta) and as a rule not so large or so numerous in each segment as in the Polychaeta, and different in shape.
When present they are either arranged in four bundles of from one to ten or even more setae, or are disposed in continuous lines completely encircling each segment of the body.
Nephridia always paired, rarely (Pontobdella) forming a network communicating from segment to segment; lumen of nephridia always intracellular, funnels pervious or impervious.
As remarked, the prevalent number of annuli to a segment is three in the Rhynchobdellidae.
The genital ducts are limited to one segment (the 8th in Capitella capitata), and there are genital setae on this and the next segment.
The funnel, which is not large, appears to open, as a rule at least, into the segment in front of that which bears the external orifice.
There are no setae and apparently only two pairs of nephridia, of which the anterior pair open commonly by a common pore on the third segment after the head, whose segments have not been accurately enumerated.
In Pontobdella and Branchellion the nephridia form a network extending from segment to segment, but there is only one pair of funnels in each segment.
The former view has been extensively held, and it is supported by the fact that in Octochaetus the first segment of the body has a pair of nephridia which is exactly like those which follow, and, like them, persists.
Rarely there is an irregular disposition of the setae which are not paired, though the total number is eight to a segment (fig.
Diagram of a transverse section of Saccocirrus showing on the left side the organs in a genital segment of a male, and on the right side the organs in a genital segment of a female.
Saccocirrus, which also lives in sand, and more closely resembles the Polychaeta, has throughout the greater length of its body on each segment a pair of small uniramous parapodia bearing a bunch of simple setae.
In the female there is in every fertile segment a pair of spermathecae opening at the nephridiopores.
For about 1/500 of a second it unites a segmentwith an instrument.
When the London arm is over segment 1, the Edinburgh arm must cover the same number.
Another variety is segment shell, made of pieces built up in a ring with a bursting charge in the centre which presently shatters it.
I may say, therefore, that the sixth segmentis like the others in plan, but that it is modified in its details.
At its foot a rounded and half degraded dorsum of stiff gravel, the nucleus of its former self, showed a segment of foundation-wall, and the state of the stone suggested the action of fire.
The third segmentconsists of nine small bones, the carpals of the wrist or the tarsals of the ankle.
In addition, all the bolts in the circumferential flanges below the axis were tightened, and at least three of the six in each segment above.
The remainder of the shield was the hydraulic part, which provided its motive force and gave the power to the segment erector.
The middle part of each A and B segment is 1 1/2 in.
The segment was built into the tunnel invert as though it were an ordinary "A" segment.
In such cases, only two or three jacks could be pushed back at a time, and only after a segment had been set in position, and the pressure taken on it, could the next jack be pushed back, and so on around the ring.
The flanges around the pile bore were made flat and furnished with twelve tapped holes, six in Segment No.
In order to allow of the entry of the screw-blade or helix of the pile, a slot was formed in the depth of Bore Segment No.
This had a tongue at one end which engaged in a recess cast to take it in Segment No.
The whole structure is joined, segment to segment, and ring to ring, by mild-steel bolts passing through bolt holes in flanges of all four faces of each segment.
In this design, also, a self-catching bolt is placed through the segment and the grip catches the bolt.
The plugs in the bottom of the sump segment were taken out, and pipes were put in, through which the silt squeezed up into the tunnel and relieved the pressure on the sump segment.
This being inserted in the orifice at the last segment of the caterpillar, is kept in place by being tied round with a piece of darning cotton, or, better still, by a contrivance shown in Fig.
To be attractive the female must be in that condition which is known by the fraternity as 'calling,' that is, she should be slightly convulsed with tremor, and the last segment of the body should be denuded of fur.
A screw works in the segment of a large worm-wheel formed on the end of the lever, and, being turned round, opens and shuts the sluices.
The effect of this connection is to reduce in the same way the proximal segment of the right umbilical vein and to convert its termination into a vena revehens.
In cooerdinating, from the morphological standpoint, the structural differences encountered in this segment of the alimentary canal, two facts become apparent.
Endgut=, the lastsegment of the intestinal canal, courses through the pelvic portion of the body cavity.
The analogous structural modifications of the proximal segment of the colon.
The well-marked duodenal fossa is bounded by a superior and inferior duodenal fold, uniting laterally in a crescentic margin containing a segment of the inferior mesenteric vein and colica sinistra artery.
The proximal segment of the main portal vein is formed by the persistence of the left half of the distal and right half of the proximal periduodenal vascular ring of the omphalo-mesenteric veins.
The transverse segment of the omentum, attached on the liver to the portal or transverse fissure, accedes to the pyloric part of the lesser curvature.
In the lower vertebrate classes the endgut is very short, corresponding only to the pelvic segment of the Mammalia (rectum), a colon proper being absent in these forms (cf.
The proximal segment of the large intestine forms an extensive sacculated pouch.
The study of this segment of the intestinal tract can therefore elucidate the mutual relationship of the vertebrate groups only to a limited degree and in special cases.
The alimentary canal and appendages, together with the hepatic portal vein and the intrahepatic segment of the postcava, have been removed.
The magnifying power of the segment of a glass sphere had been noted by Alhazen, who had observed also that the magnification was increased by increasing the size of the segment used.
The abdomen of insects consists of a varying number of visible segments; each segment is covered by an upper and lower chitinous plate connected by membrane, there being no side plates as are found in the thorax.
At the lower surface of each thoracic segment is attached a pair of legs, the members of each pair being separated by the sternum of the segment to which they belong.
When the gate at the bottom of the garden was open, there was a view of the inlet, bordered with marsh grass, and farther away a segment of the open sea, with the lighthouse on Goose Rock.
But I see a larger segmentof the circle than we could see two years ago.
The middle segment of the body is nearly round and has near the center a large conical perforation.
The California Indians made mortars by knocking a segment off a bowlder, making a flat surface, and working out with a hammer and chisel,[44] while the tribes of the interior worked directly from the surface of a suitable rock.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "segment" in a variety of sentences. We hope that you will now be able to make sentences using this word.
