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

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.

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

Polythalamous :: Polythalamous (a.) Many-chambered; -- applied to shells of Foraminifera and cephalopods. See Illust. of Nautilus.

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

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..

Siphuncle :: Siphuncle (n.) The tube which runs through the partitions of chambered cephalopod shells.

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

Goniatite :: Goniatite (n.) One of an extinct genus of fossil cephalopods, allied to the Ammonites. The earliest forms are found in the Devonian formation, the latest, in the Triassic..

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..

Hamite :: Hamite (n.) A fossil cephalopod of the genus Hamites, related to the ammonites, but having the last whorl bent into a hooklike form..

Loligo :: Loligo (n.) A genus of cephalopods, including numerous species of squids, common on the coasts of America and Europe. They are much used for fish bait..

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..

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

Squid :: Squid (n.) Any one of numerous species of ten-armed cephalopods having a long, tapered body, and a caudal fin on each side; especially, any species of Loligo, Ommastrephes, and related genera. See Calamary, Decacerata, Dibranchiata..

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..

Dibranchiata :: Dibranchiata (n. pl.) An order of cephalopods which includes those with two gills, an apparatus for emitting an inky fluid, and either eight or ten cephalic arms bearing suckers or hooks, as the octopi and squids. See Cephalopoda..

Sea Devil :: Sea devil () Any large cephalopod, as a large Octopus, or a giant squid (Architeuthis). See Devilfish..

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

Scaphite :: Scaphite (n.) Any fossil cephalopod shell of the genus Scaphites, belonging to the Ammonite family and having a chambered boat-shaped shell. Scaphites are found in the Cretaceous formation..

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