Century Dictionary and Cyclopedia
- A class of Mollusca (formerly an order of gastropods), having the foot fitted for burrowing; the tooth-shells, also called Cirribranchiata, Prosopocephala, and Solenoconchæ. They have an elongate cylindrical body exhibiting bilateral symmetry in the disposition of its parts, inclosed in a tubular shell open at both ends; many long cirri or tentacles; euthyneural nervous system, with cerebral, pleural, pedal, and visceral pairs of nerves; paired nephridia and ctenidia; no heart; and distinct sexes. There are two well-marked families, Dentaliidæ and Siphonodentaliidæ. See cut under
GNU Webster's 1913
- n. (Zoöl.) A class of marine cephalate Mollusca having a tubular shell open at both ends, a pointed or spadelike foot for burrowing, and many long, slender, prehensile oral tentacles. It includes Dentalium, or the tooth shells, and other similar shells. Called also
Prosopocephala, and Solenoconcha.
- n. small class of bilaterally symmetrical marine forms comprising the tooth shells
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