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Cuttlefish :: Cuttlefish (n.) A cephalopod of the genus Sepia, having an internal shell, large eyes, and ten arms furnished with denticulated suckers, by means of which it secures its prey. The name is sometimes applied to dibranchiate cephalopods generally..

Ammonitoidea :: Ammonitoidea (n. pl.) An extensive group of fossil cephalopods often very abundant in Mesozoic rocks. See Ammonite.

Cephalo :: Cephalo () A combining form denoting the head, of the head, connected with the head; as, cephalosome, cephalopod..

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

Nautilus :: Nautilus (n.) The only existing genus of tetrabranchiate cephalopods. About four species are found living in the tropical Pacific, but many other species are found fossil. The shell is spiral, symmetrical, and chambered, or divided into several cavities by simple curved partitions, which are traversed and connected together by a continuous and nearly central tube or siphuncle. See Tetrabranchiata..

Infundibulum :: Infundibulum (n.) The siphon of Cephalopoda. See Cephalopoda.

Argonaut :: Argonaut (n.) A cephalopod of the genus Argonauta.

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

Protoconch :: Protoconch (n.) The embryonic shell, or first chamber, of ammonites and other cephalopods..

Acetabulifera :: Acetabulifera (n. pl.) The division of Cephalopoda in which the arms are furnished with cup-shaped suckers, as the cuttlefishes, squids, and octopus; the Dibranchiata. See Cephalopoda..

Cephalopodous :: Cephalopodous (a.) Belonging to, or resembling, the cephalopods..

Proostracum :: Proostracum (n.) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone..

Cephalopodic :: Cephalopodic (a.) Alt. of Cephalopodou.

Gladius :: Gladius (n.) The internal shell, or pen, of cephalopods like the squids..

Spermatophore :: Spermatophore (n.) A capsule or pocket inclosing a number of spermatozoa. They are present in many annelids, brachiopods, mollusks, and crustaceans. In cephalopods the structure of the capsule is very complex..

Chromatophore :: Chromatophore (n.) A contractile cell or vesicle containing liquid pigment and capable of changing its form or size, thus causing changes of color in the translucent skin of such animals as possess them. They are highly developed and numerous in the cephalopods..

Ammonite :: Ammonite (n.) A fossil cephalopod shell related to the nautilus. There are many genera and species, and all are extinct, the typical forms having existed only in the Mesozoic age, when they were exceedingly numerous. They differ from the nautili in having the margins of the septa very much lobed or plaited, and the siphuncle dorsal. Also called serpent stone, snake stone, and cornu Ammonis..

Argonauta :: Argonauta (n.) A genus of Cephalopoda. The shell is called paper nautilus or paper sailor.

Devilfish :: Devilfish (n.) A large cephalopod, especially the very large species of Octopus and Architeuthis. See Octopus..

Siphoniferous :: Siphoniferous (a.) Siphon-bearing, as the shell of the nautilus and other cephalopods..

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