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.
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Alt. of Cephalopode
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One of the Octocerata.
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A subordinate; a subaltern.
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Being, acting, or growing, under water in the sea; as, submarine navigators; submarine plants.
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Any one of the legendary Greek heroes who sailed with Jason, in the Argo, in quest of the Golden Fleece.
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