It is known as an extra-branchial system, and an early stage of its development in the Lamprey is shewn in fig.
In the Lamprey the auditory vesicle is formed in the usual way by an invagination of the epiblast, which soon becomes vesicular, and for a considerable period retains a simple character.
The breeding season sets in during the second half of April; and shortly after depositing its generative products the Lamprey dies.
We have already seen that in the Lamprey the cornea is nothing else but the slightly modified and more transparent epidermis and dermis.
The resemblances between the Tadpole and the Lampreyare probably due to both of them being descended from this stock.
The fate of the yolk-cells in the Lamprey is different from that in most other Vertebrata with an equally large amount of yolk.
In the Newt and Lamprey this differentiation does not take place, but the part in question simply becomes the iris.
At the same time there is no doubt that certain parts of the skeleton of the adult Lamprey have, as pointed out by Huxley, striking points of resemblance to parts of a true mandibular and hyoid arches.
The yolk may either, as in the lamprey or frog, form a simple thickening of the alimentary wall in this region, or it may constitute a well-developed yolk-sack as in Elasmobranchii and the Amniota.
Lamprey a separation between the two cavities does not occur during the Ammocoete stage.
The lowest form of the latter is Ammocoetes, the larva of the Lamprey (Petromyzon).
In the Lamprey fishes as well as in Hatteria, it reaches a further degree of development.
The Lamprey has a hole on top of its head through which it spouts water, somewhat like a Whale, and the fins are formed by a lengthening out of the skin instead of having a set of bones or spines for that purpose.
There are several different species belonging to the Lamprey family.
Here the eggs are laid, and the mother Lampreywatches near until the eggs hatch.
The mouth of the Lamprey is not only formed like that of the Leech, but it has the same property of sticking close to and sucking any body that is applied to it.
This adhesive or sticking quality in the Lampreyis somewhat increased by the slimy substance which is smeared all over its body.
The Lamprey is of a lighter color than the Eel, and is not so graceful, but of a rather clumsy form.
The kind known as the Lesser Lamprey inhabits Europe, Japan and the lakes of South America.
This wonderful strength of suction is supposed to arise from the power of the Lamprey to exhaust the air within its body by the hole over the nose, while the mouth is closely fixed to the object, and allows no air to enter.
There is not much in the structure of the lamprey which may be preserved in the rocks.
Mueller, in 1865, showed that all the ova in the lamprey were of the same size, and that after spawning no small reproductive bodies remained to be developed later.
Also, the repeated moving of one stone may subserve the same purpose for the lamprey in covering its eggs with sand as would the less frequent removal of many.
It is more like the tail of a lamprey than that of Coccosteus.
There is no doubt that the bullhead, or horned pout (Ameiurus nebulosus), is by far the greatest sufferer from lampreyattacks in Cayuga Lake.
The Ostracophores have been regarded as monstrous lampreys in coat of mail, and the possibility of a lamprey origin even for Arthrodires has been suggested.
Preparations made by students of Professor Jacob Reighard in the University of Michigan show clearly that the lamprey stomach contains muscular tissue as well as the blood of fishes.
In fact the lamprey is farther from the true fish in structure than a perch is from an eagle.
The flesh of the lamprey is wholesome, and the larger species, especially the great sea lamprey of the Atlantic, Petromyzon marinus, are valued as food.
Larval Brook Lamprey in its burrow in a glass filled with sand.
The supposed lamprey fossil of the Devonian of Scotland, Palaeospondylus, has little in common with the true lampreys.
The eggs are small and are usually laid in brooks away from the sea, and in most cases the adult lamprey dies after spawning.
The vertebral column agrees with that of thelamprey in having the notochord in part persistent.
But Sostratus, in his books on Animals (and there are two books of his on this subject, and with this title), agrees with those who assert that the lamprey and the viper do breed together.
And its ancestors never had any limbs at all, for the earliestlamprey embryo shows no traces of them.
When thelamprey is hungry he puts his mouth against the side of some fish, exhausts the water between, and then the pressure of the outside water holds him there tightly.
But the lamprey has no trace of arm or leg, not even a bone or cartilage hidden under the skin.
When this is done, the fish swims away and the lamprey rides with it, giving no thought to where he is going, but all the while scraping away the flesh with his rasplike teeth.
In front the lamprey seems to be cut off short, but if we look carefully we see that the body ends in a round disk of a mouth, and that this disk is beset by rows of sharp teeth.
Anything from a dead lamprey or a bunch of sunfish eggs to a piece of tomato can is grateful to him.
The lamprey is not a fish at all, only a wicked imitation of one which can deceive nobody.
Lamprey fresh baked, flampeyn flourished with an escutcheon royal, therein three crowns of gold, planted with flowers de luce, and flowers of camomile wrought of confections.
The eel has a bony skeleton, but that of the lamprey is soft and imperfect.
The lamprey has seven external orifices like a row of round button-holes for breathing on each side, and apparently, without any protection.
The lamprey undergoes a peculiar change of colour, being at times scarcely visible in the water, with variations from a silvery hue to a dark-brown back and a white belly.
In Holland the lamprey is largely used as an article of bait.
XXI-78] The lamprey has not always been the fashion, but it has had brilliant and glorious epochs.
The Italian epicures of that remarkable era used to kill the lamprey in Candian wine.
In the case of Tichelis, now ground squirrel, and Hawt, the present lamprey eel, we have cases of personal collision resulting in transformation.
The present lamprey eel has marks, as it were, of holes in his sides.
He changes Hawt, the porter at the dangerous river, into a lamprey eel, whose children are to be eaten by Indians in the future.
On the other hand in most species of lamprey (Petromyzon) cartilaginous pieces forming imperfect neural arches (fig.
The Myxinoids, although very highly specialised in their own way, are at distinctly a lower stage of development than the adult Lamprey, and come nearer to the larval Lamprey or Ammocoete.
The development of the lamprey is of much morphological importance from the archaic nature of the creature and from the fact that the egg is comparatively small (about 1 mm.
A marine lampreyis an eel-like creature 70 to 75 cm.
In Bdellostoma and in the larva of Petromyzon the gill-sacs open directly from the pharynx to the exterior, but in the adult lamprey and in Myxine the original relations are modified.
In an adult river lamprey the basketwork consists on each side of a series of eight vertical half-hoops of cartilage.
The inspiratory current passes inwards by the mouth opening in the larval lamprey, by the pituitary tube in Myxine, while in the adult lamprey both expiration and inspiration takes place through the external gill-openings.
In the adult lamprey a different modification is found.
The vertebral column of the lamprey is represented by a persistent notochord surrounded by a thick sheath, which shows no signs of invasion by cartilage cells or of segmentation.
The heart (5) of the lamprey consists of an atrium and a single ventricle, the atrium on the left, the ventricle on the right.
The lamprey chooses as spawning ground a part of the stream with fairly rapid current and where the bottom is composed of sand with scattered stones.
This larval stage of the fresh-water lamprey of Europe was long supposed to be a separate genus of Cyclostomes and was called Ammocoetes.
After the metamorphosis the now mature lamprey accomplishes the act of reproduction and then apparently dies almost immediately.
It has been worked out so far only in the river lamprey (7).
The original genus Petromyzon (which it is now customary to subdivide into a number of genera) includes the large sea lamprey (P.
The Ammocoetes possesses a functional liver with bileduct, while in the adult river lamprey the alimentary canal is degenerate.
An old fisherman told me that a strong man could not pull a large lamprey loose from a rock to which it had attached itself.
A friend of mine says he once saw in the St. Lawrence a pike as long as his arm with a lamprey eel attached to him.
At this stage the general resemblance of the brain to that of the lamprey is striking.
In the Cyclostomata, of which the lamprey (Petromyzon) is an example, the minute brain is much more complex, though it is still only a very slight enlargement of the anterior end of the cord.
In the lamprey and in Dipnoans the lateralis vagi loses its superficial position in the adult and comes into close relation with the notochord.
The only conceivable explanation of this developmental history of the thyroid in the lamprey is that it is a repetition of phylogenetic history.
In the larvallamprey the thyroid develops as a longitudinal groove on the pharyngeal floor.
Next morning, he had the satisfaction of hauling in the trap with the lamprey in a rampagious humour inside.
The lamprey was known to lurk somewhere in the deep pool at Scott's Mill.
The Lamprey was once very plentiful in the Thames, and considered a dainty.
In the bell-gastrula of the amphioxus and in the hooded gastrula of the lamprey and the frog the germinal layers are found to be closed tubes or vesicles from the first.
Ovum-segmentation of the lamprey (Petromyzon fluviatalis), in four successive stages.
There is only one step from the lampreyto the mollusks or soft-bodied animals, and this is the course which animal organisation seems really to have taken in its progress.
It is by a similar sort of proceeding that leeches relieve people of the blood they want to get rid of; and in the same way the lamprey draws out the blood of the animals upon which she fastens.
Well, the lamprey feeds herself just in the same way as the leech does.
It was formerly the custom of the city of Gloucester to present a lamprey pie to the king at Christmas.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "lamprey" in a variety of sentences. We hope that you will now be able to make sentences using this word.
