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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.

Baculite :: Baculite (n.) A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite..

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

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..

Tetrabranchiata :: Tetrabranchiata (n. pl.) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc..

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

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

Prosoma :: Prosoma (n.) The anterior of the body of an animal, as of a cephalopod; the thorax of an arthropod..

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..

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

Cephalopode :: Cephalopode (n.) One of the Cephalopoda.

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..

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..

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

Hectocotylus :: Hectocotylus (n.) One of the arms of the male of most kinds of cephalopods, which is specially modified in various ways to effect the fertilization of the eggs. In a special sense, the greatly modified arm of Argonauta and allied genera, which, after receiving the spermatophores, becomes detached from the male, and attaches itself to the female for reproductive purposes..

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

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

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..

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..

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

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