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Devilfish :: Devilfish (n.) A huge ray (Manta birostris / Cephaloptera vampyrus) of the Gulf of Mexico and Southern Atlantic coasts. Several other related species take the same name. See Cephaloptera.

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

Anaptychus :: Anaptychus (n.) One of a pair of shelly plates found in some cephalopods, as the ammonites..

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

Acephalous :: Acephalous (a.) Deficient and the beginning, as a line of poetry..

Encephalous :: Encephalous (a.) Having a head; -- said of most Mollusca; -- opposed to acephalous.

Decacerata :: Decacerata (n. pl.) The division of Cephalopoda which includes the squids, cuttlefishes, and others having ten arms or tentacles; -- called also Decapoda. [Written also Decacera.] See Dibranchiata..

Epencephalic :: Epencephalic (a.) Pertaining to the epencephalon.

Siphon :: Siphon (n.) The siphuncle of a cephalopod shell.

Spirulate :: Spirula (n.) A genus of cephalopods having a multilocular, internal, siphunculated shell in the form of a flat spiral, the coils of which are not in contact..

Acephalous :: Acephalous (a.) Without a distinct head; -- a term applied to bivalve mollusks.

Siphonifer :: Siphonifer (n.) Any cephalopod having a siphonate shell.

Encephalos :: Encephalos (n.) The encephalon.

Dicyemata :: Dicyemata (n. pl.) An order of worms parasitic in cephalopods. They are remarkable for the extreme simplicity of their structure. The embryo exists in two forms.

Mesocephalous :: Mesocephalous (a.) Mesocephalic.

Aurocephalous :: Aurocephalous (a.) Having a gold-colored head.

Mesencephalon :: Mesencephalon (n.) The middle segment of the brain; the midbrain. Sometimes abbreviated to mesen. See Brain.

Cephalostyle :: Cephalostyle (n.) The anterior end of the notochord and its bony sheath in the base of cartilaginous crania.

Architeuthis :: Architeuthis (n.) A genus of gigantic cephalopods, allied to the squids, found esp. in the North Atlantic and about New Zealand..

Mollusca :: Mollusca (n. pl.) One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and Lamellibranchiata, or Conchifera. These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or m

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