This would be comprehensible on the assumption that the retarding effect which the formation of the oral has on the aboral polyp was indeed of the nature of a flow of material towards the oral pole.
A piece of Tubularia when cut out from a stem and suspended in water will regenerate at the aboral pole not a stolon but a polyp, so that we have an animal terminating at both ends of its body in a head.
This idea, however, was found to be incorrect since when the stem was cut into two or more pieces each piece formed a polyp at once at its oral pole and regenerated the aboral polyps also, but again with the usual delay.
The process of polyp regeneration at theaboral pole could, however, be accelerated and its velocity made equal to that of the regeneration of the oral polyp by suppressing the formation of the latter.
It was, therefore, obvious that the formation of the oral polyp retarded the formation of the aboral polyp.
The parasitic hydromedusa Mnestra, usually found attached in this position by the aboral pole of its umbrella.
Entocolax, mouth at free extremity, animal fixed by aboral orifice of pseudopallium, Pacific.
The rows of locomotive paddles first appear as four longitudinal equidistant linear thickenings of the epiblast near the aboralpole (fig.
The ciliated disc, which in the free larva forms a kind of cup directed towards the aboral end, turns in upon itself towards the oral face.
These four next become divided by an equatorial furrow into four dorsal and four ventral segments, the former constituting the aboralpole and forming the epiblast, and the latter the oral pole.
The shaded part is the oral side of the ring, the clear part the aboral side.
A projecting ring of large cells is formed, dividing the larva into oral and aboral parts.
The oral of these is the rudiment of a tentacle (t), and the aboral of a nectocalyx (nc).
The line of junction between the left and right peritoneal vesicles forms in the larva a ring-like mesentery dividing the oral from the aboral part of the body cavity.
This arises as a prominence at the aboral pole, containing a prolongation of the gastrovascular cavity.
The larva has a triangular form with an aboral apex, corresponding with the summit of the dome of the Flustrella larva, and an oral base.
In all the larvae there is present a ciliated ring, which separates an oral from an aboral face, and is apparently homologous throughout the series.
The invaginated tube would seem to give rise to the so-called stomach, while the chamber at its aboral extremity is no doubt the infundibulum, which as may be gathered from Kowalevsky's statements, is lined by a flattened epithelium.
The shell-gland forms a pit at the aboral end of the body, and in Cymbulia a chitinous plug appears to be normally formed in this pit.
At the time when the larva becomes liberated from the maternal cell it has the form of a barrel with a slight constriction in the middle separating the oral from the aboral end.
Doratopsis, body very long and slender withaboral spine, dorsal arms very short.
They originate at the aboral extremity where they remain in Spirula (fig.
It will be seen from this quotation that the aboralpart of the body is supposed to elongate to form the trunk, while the praeoral region is derived from one of the tentacles.
A is an ideal representation, would appear to have had a dome-shaped body, with a flattened oral surface and a rounded aboral surface.
The anus was very probably originally situated at the aboral apex.
The usual view that radiate forms have become bilateral by the elongation of the aboral dome into the trunk is probably erroneous.
A larval form with a single ciliated ring surrounding the mouth, and an aboral ciliated ring or disc (fig.
The circumoral nerves issue from under the lantern and run along the oral, cross over at the edge of the shell and then run along the aboral side.
The five radial nerves converge at the five ocular areas near the center of the aboral region.
In the circumoral and oral radial nerves the nerve cells are thickly massed from side to side, but in the upper part of the aboral nerve there is an evident arrangement of nerve cells in zones.
Camera lucida drawing of a part of an aboral nerve showing position of cell areas.
Drawing of the upper part of an aboralradial nerve.
After the nerve turns to run on the aboral side there is no change in arrangement until the region of the tube feet is reached.
The entire shell, seen from the base of the aboral pole (dorsal and ventral valve connected by delicate teeth, catching into one another).
In theaboral half of the shell-cavity lies the red central capsule, in the oral half the green phaeodium.
In the oral part of the shell-cavity the dark phaeodium, in the aboral part the central capsule with two nuclei (a dorsal and a ventral).
Young individuals are often, and adults occasionally, found floating free in the water, either with the mouth uppermost and the tentacles extended so as to cover as large an area as possible or with the aboral pole at the surface.
Each quadrant of the column has apparently the power of producing, in a definite zone nearer the aboral pole than the mouth, a single bud; but the buds of the different quadrants are not produced simultaneously.
Tentacles soon sprout out from one end of the embryo's body and a mouth is formed; the column becomes more slender and attaches itself by the aboral pole to some solid object.
The apex of the cone, usually somewhat rounded off, is therefore directed towards the aboral or apical pole of the central capsule and separated from it by a larger or smaller interval.
When this is simple, without lobes, and ovoid or conical, they generally lie in its aboral half above the podoconus (Pl.
The vertical main axis of the latter is also that of the nucleus, which usually lies somewhat nearer to the aboral pole.
It {xxxix}is commonly placed excentrically, and most usually in the apical or aboral portion of the central capsule, either between its apex and the podoconus, or quite excentrically on the dorsal aspect.
The aboral nervous system, if indeed it be present at all, is very slightly developed.
Echinoderma with the viscera enclosed in a calcified and plated theca, of which the oral surface is uppermost, and which is usually attached, either temporarily or permanently, by the aboral surface.
A, from the side; B, the plates around the aboral pole.
Crinoidea in which the base consists of BB only, the aboral prolongations of the chambered organ being interradial; new columnals are introduced at the extreme proximal end of the stem.
Asteroidea and Ophiuroidea, and therefore not homologous with the radially disposed plates often seen around the aboral pole of those animals.
The mesoblast cells travel to the aboral pole of the embryo, and there form a cross-shaped mass, the arms of which lie in the sagittal and transverse planes (perradii).
An aboral vessel embraces the sense-organ, but has no external opening.
Locomotion is effected by strokes of the paddles in an aboral direction, driving the animal mouth forwards through the water: each paddle or comb (Gr.
Schematic drawing of a Cydippid from the aboral pole.
The body, representing the hydranth of an ordinary hydroid, has the aboral portion modified into a float, from which hangs down a proboscis bearing the mouth.
At the same time it produces buds from an aboral stolon.
Woltereck considers the siphonophores most nearly allied to the Narcomedusae, producing like the buds from an aboral stolon, the first bud being represented by the pneumatophore or protocodon, in different cases.
Note in the angle of each two adjoining rays paired glandular masses which empty by a common duct on the aboral surface.
Note on the aboral surface of the disk a small striated calcareous plate, the madreporite or madreporic plate.
Make a drawing of the aboral surface showing all these parts.
Now begin at the tip of each ray and cut away the aboral wall of each, leaving, however, a single arm intact.
In both the madreporite and anus are on the aboral side, while the mouth is centrally located on the oral side.
Note on the aboral aspect, diverging from the medial anal aperture, five double rows of pores.
The entire aboral surface as well as a greater part of the oral side is thickly studded with the calcareous ossicles of the body-wall.
Note on the aboral surface, surrounding the median-placed anal aperture, a series of small plates.
The alimentary canal, starting in Aristotle's lantern, winds in two and a half coils around the inside of the shell, supported by mesenteries, and terminates in the excretory opening on the aboral surface.
The ten spaces diverge from the /peristome/, or soft part around the mouth, in the center of the lower surface, and converge in the small area at the top or aboral side.
Shell subspherical, pellucid, thinner and more fragile than in the other species of the genus, with three aboral perradial feet in the lower third, and three interradial teeth around the wide mouth.
On both sides of the opposite aboral pole (to the right and left) are two conical parapylae or secondary openings (u, u).
The pores are separated by high parallel crests and arranged in longitudinal rows, which converge towards the aboral hinge.
Conchopsis possesses at the aboral hinge not the two prominent caudal horns, which mark the following genus Conchoceras, but in some species a peculiar ligament connects the aboral ends of both valves.
The size of the meshes or alveoles is usually smallest on the aboral apex of the shell, and increases gradually towards the mouth.
The number of the aboral feet, and their position relative to the circoral teeth, are different but probably constant in each single species, and serve, in the first place, for the distinction of genera and species.
Horns of the aboral hinge prolonged, conical, half as long as the shell, the ventral somewhat larger than the dorsal.
Shell triangular, with three rounded corners; the two lateral sides nearly straight, equal, the aboral side more or less convex and somewhat shorter.
Originally these three teeth alternate regularly with the three aboral feet, so that the latter may be regarded as perradial, the former as interradial (Pl.
It is always enclosed in the aboral or posterior half of the shell-cavity, whilst the oral or anterior half is filled up by the phaeodium.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "aboral" in a variety of sentences. We hope that you will now be able to make sentences using this word.
