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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

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..

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

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

Octocerata :: Octocerata (n.pl.) A suborder of Cephalopoda including Octopus, Argonauta, and allied genera, having eight arms around the head; -- called also Octopoda..

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..

Mesozoa :: Mesozoa (n. pl.) A group of very lowly organized, wormlike parasites, including the Dicyemata. They are found in cephalopods. See Dicyemata..

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..

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..

Cephalopoda :: Cephalopoda (n. pl.) The highest class of Mollusca.

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

Cephalopod :: Cephalopod (n.) Alt. of Cephalopod.

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..

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..

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..

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..

Orthoceras :: Orthoceras (n.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa..

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

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

Decapoda :: Decapoda (n. pl.) A division of the dibranchiate cephalopods including the cuttlefishes and squids. See Decacera.

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