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One of the Tubulibranchiata.

A group of gastropod mollusks having a tubular shell. Vermetus is an example.

Having but one gill, as certain molluscs.

Same as Zygobranchia.

A division of marine gastropods in which the gills are developed on both sides of the body and the renal organs are also paired. The abalone (Haliotis) and the keyhole limpet (Fissurella) are examples.

Of or pertaining to the Zygobranchia.

ms are furnished with cup-shaped suckers, as the cuttlefishes, squids, and octopus; the Dibranchiata. See Cephalopoda.

A genus of marine mollusks of the order Tectibranchiata; the sea hare. Some of the species when disturbed throw out a deep purple liquor, which colors the water to some distance. See Illust. in Appendix.

anical words, to indicate the base or position at or near a base; forming a base; as, basibranchials, the most ventral of the cartilages or bones of the branchial arches; basicranial, situated at the base of the cranium; basifacial, basitemporal, etc.

Having gills; branchiate; as, branchiferous gastropods.

Those Gastropoda that breathe by branchiæ, including the Prosobranchiata and Opisthobranchiata.

The state of being made up of branchiate segments. R. Wiedersheim.

A branchiostegal ray. See Illustration of Branchial arches in Appendix.

A marine univalve shell of the genus Bulla and allied genera, belonging to the Tectibranchiata.

, or pertaining to the Buccinidæ, a family of marine univalve shells. See Whelk, and Prosobranchiata.

A disease in horses; a crack on the band of the pastern. Branchial clefts. See under Branchial.

That class of Mollusca which includes the bivalve shells; the Lamellibranchiata. See Mollusca.

ulated suckers, by means of which it secures its prey. The name is sometimes applied to dibranchiate cephalopods generally.

ers having ten arms or tentacles; -- called also Decapoda. [Written also Decacera.] See Dibranchiata.

A division of the dibranchiate cephalopods including the cuttlefishes and squids. See Decacera.