Prosopocephala

from The Collaborative International Dictionary of English v.0.48

Scaphopoda \Sca*phop"o*da\, n. pl. [NL., from Gr. ska`fh a boat
   + -poda.] (Zool.)
   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}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Prosopocephala \Pros`o*po*ceph`a*la\, n. pl. [NL., fr. Gr.
   pro`swpon face, appearance + ? head.] (Zool.)
   Same as {Scaphopoda}.
   [1913 Webster]