Family 



Philinidce FISCHER, 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 I'O'l. 



The family Philinidce is most nearly allied to Scaphandridce, 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 Aglajidce, 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. 



