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Octopus :: Octopus (n.) A genus of eight-armed cephalopods, including numerous species, some of them of large size. See Devilfish,.

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..

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

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

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..

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

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

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

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.

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

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

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

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..

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..

Rhyncholite :: Rhyncholite (n.) A fossil cephalopod beak.

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

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..

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

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..

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..

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