PHILINID®. 1 
Family PHILINID. 
Philinide Fiscuer, Man. de Conch. p. 563. 
Shell capable of containing but a small part of the body, entirely 
internal, covered by the reflexed and united mantle ; whitish, fragile, 
open from in front or below, consisting of 2 to 1 whorls; spire sunken 
or absent ; aperture extremely large, the outer lip often produced in 
a lobe or point above. 
Body oblong, the head-shield having no tentacular processes, pro- 
vided with sessile eyes or without them ; foot truncated or rounded 
behind; parapodial lobes very large and conspicuous, more or less 
folded over the back. 
Radula lacking central teeth ; laterals large, uncini few or none. 
Formula varying from 6:1:0°1°6 to 1:01. 
The family Philinide is most nearly allied to Secaphandride, but 
differs in having the mantle reflexed and closed over the shell, in 
lacking rhachidian teeth, and in the degeneration of the shell as a 
protective armor. 
Synopsis of Genera. 
Genus PHILINE Ascanius. 
Shell spiral and moderately developed ; foot about two-thirds the 
length of body, obliquely truncated. ; 
Genus? PHILINOPSIS Pease. 
The characters given by Pease are quite insufficient to show the 
position of the group. It may belong to Aglajid@, which see. 
Genus CHELIDONURA A. Ad. 
Shell small, rudimentary, uncoiled ; foot long, rounded behind ; 
epipodial lobes long; mantle with two tail-like appendages ; head 
with three groups of bristle-bearing tubes. 
Genus CRYPTOPHTHALMUS Ehrenb. 
Shell small, rudimentary, uncoiled ; foot as long as body, rounded 
behind; parapodial lobes large, as long as foot; mantle without 
tail-like appendages; head lacking bristle-like sense-organs. 
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