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Pneumoskeleton :: Pneumoskeleton (n.) A chitinous structure which supports the gill in some invertebrates.

Gnathostoma :: Gnathostoma (n. pl.) A comprehensive division of vertebrates, including all that have distinct jaws, in contrast with the leptocardians and marsipobranchs (Cyclostoma), which lack them..

Homologous :: Homologous (a.) Being of the same typical structure; having like relations to a fundamental type to structure; as, those bones in the hand of man and the fore foot of a horse are homologous that correspond in their structural relations, that is, in their relations to the type structure of the fore limb in vertebrates..

Heterogangliate :: Heterogangliate (a.) Having the ganglia of the nervous system unsymmetrically arranged; -- said of certain invertebrate animals.

Amniota :: Amniota (n. pl.) That group of vertebrates which develops in its embryonic life the envelope called the amnion. It comprises the reptiles, the birds, and the mammals..

Water Pore :: Water pore () A pore by which the water tubes of various invertebrates open externally.

Vulva :: Vulva (n.) The orifice of the oviduct of an insect or other invertebrate.

Somatopleure :: Somatopleure (n.) The outer, or parietal, one of the two lamellae into which the vertebrate blastoderm divides on either side of the notochord, and from which the walls of the body and the amnion are developed. See Splanchnopleure..

Sauropsida :: Sauropsida (n. pl.) A comprehensive group of vertebrates, comprising the reptiles and birds..

Tongue :: Tongue (n.) an organ situated in the floor of the mouth of most vertebrates and connected with the hyoid arch.

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..

Water Tube :: Water tube () One of a system of tubular excretory organs having external openings, found in many invertebrates. They are believed to be analogous in function to the kidneys of vertebrates. See Illust. under Trematodea, and Sporocyst..

Neuroskeleton :: Neuroskeleton (n.) The deep-seated parts of the vertebrate skeleton which are relation with the nervous axis and locomation.

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..

Brain :: Brain (n.) The whitish mass of soft matter (the center of the nervous system, and the seat of consciousness and volition) which is inclosed in the cartilaginous or bony cranium of vertebrate animals. It is simply the anterior termination of the spinal cord, and is developed from three embryonic vesicles, whose cavities are connected with the central canal of the cord; the cavities of the vesicles become the central cavities, or ventricles, and the walls thicken unequally and become the three seg

Osteology :: Osteology (n.) The science which treats of the bones of the vertebrate skeleton.

Eye-spot :: Eye-spot (n.) A simple visual organ found in many invertebrates, consisting of pigment cells covering a sensory nerve termination..

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

Vagina :: Vagina (n.) The terminal part of the oviduct in insects and various other invertebrates. See Illust., of Spermatheca..

Spermatheca :: Spermatheca (n.) A small sac connected with the female reproductive organs of insects and many other invertebrates, serving to receive and retain the spermatozoa..

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