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Invertebrate :: Invertebrate (n.) One of the Invertebrata.

Tunicata :: Tunicata (n. pl.) A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter. They were formerly classed with acephalous mollusks. The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water. The pharynx is usually dilated in the form of a sac, pierced by several series of ciliated slits, and se

Hypoglossal :: Hypoglossal (a.) Under the tongue; -- applied esp., in the higher vertebrates, to the twelfth or last pair of cranial nerves, which are distributed to the base of the tongue..

Monocondyla :: Monocondyla (n. pl.) A group of vertebrates, including the birds and reptiles, or those that have only one occipital condyle; the Sauropsida..

Epicoele :: Epicoele (n.) A cavity formed by the invagination of the outer wall of the body, as the atrium of an amphioxus and possibly the body cavity of vertebrates..

Liver :: Liver (n.) A very large glandular and vascular organ in the visceral cavity of all vertebrates.

Peristome :: Peristome (n.) The membrane surrounding the mouth of an invertebrate animal.

Hermaphrodite :: Hermaphrodite (n.) An individual which has the attributes of both male and female, or which unites in itself the two sexes; an animal or plant having the parts of generation of both sexes, as when a flower contains both the stamens and pistil within the same calyx, or on the same receptacle. In some cases reproduction may take place without the union of the distinct individuals. In the animal kingdom true hermaphrodites are found only among the invertebrates. See Illust. in Appendix, under Helmi

Spleen :: Spleen (n.) A peculiar glandlike but ductless organ found near the stomach or intestine of most vertebrates and connected with the vascular system; the milt. Its exact function in not known.

Gizzard :: Gizzard (n.) A thick muscular stomach found in many invertebrate animals.

Bone :: Bone (n.) The hard, calcified tissue of the skeleton of vertebrate animals, consisting very largely of calcic carbonate, calcic phosphate, and gelatine; as, blood and bone..

Otozoum :: Otozoum (n.) An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones..

Arm :: Arm (n.) A limb, or locomotive or prehensile organ, of an invertebrate animal..

Epicoracoid :: Epicoracoid (n.) A ventral cartilaginous or bony element of the coracoid in the shoulder girdle of some vertebrates.

Beak :: Beak (n.) The long projecting sucking mouth of some insects, and other invertebrates, as in the Hemiptera..

Uropoetic :: Uropoetic (a.) Of, pertaining to, or designating, a system of organs which eliminate nitrogenous waste matter from the blood of certain invertebrates..

Pylorus :: Pylorus (n.) A posterior division of the stomach in some invertebrates.

Testa :: Testa (n.) The external hard or firm covering of many invertebrate animals.

Tentacle :: Tentacle (n.) A more or less elongated process or organ, simple or branched, proceeding from the head or cephalic region of invertebrate animals, being either an organ of sense, prehension, or motion..

Lithocyst :: Lithocyst (n.) A sac containing small, calcareous concretions (otoliths). They are found in many Medusae, and other invertebrates, and are supposed to be auditory organs..

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