Fam. 42.] N ATDRAL HISTORY SOCIETY. IIS 



1. DiAPHANA, Br. 



Shell thill, transparent, oval-globular; spire veiy short; aper- 

 ture mucli widened in front; columella a little sinuous ; outer 

 lip sinuous. Head disk broad and short ; tentacular lobes short, 

 ■conical, lateral, wide apart; foot short, bilobed behind. 



1. Diaphana debilis, Gld. Shell obliquely ovate, small, trans- 

 parent, smooth, partially umbilicated ; whorls terminating in a 

 level spire ; pillar lip terminating abruptly in front. Greenish 

 white. The last whorl includes all the others. L. 3-J ; D. 2^ ; 

 An. 180 ; Wh. 4; Ap. 1.— Northern; south to N. J.; 6-50 fathoms. 

 Family 40. BULLID/E. 



Shell external but partially covered by the side lobes of the 

 foot; spire involute. 



■ 1. Haminea, Leach. 



Shelh oval-globular, spiral, horny, thin, white or colorless; 

 covered with a slight epidermis. 



1. Hamima solUarm, Say. (Fig. 53). Shell thin, fragile, pel- 

 lucid, oval, and covered with numerous, minute, revolving lines; 

 more or less of a pit in place of a spire ; aperture narrowly 

 linear above, wdde below ; umbilicus none ; outer lip regularly 

 curved. White. L. 9 ; D. 6. — Whole coast. Common. 

 Family 41. PHILINID/E. 



Shell usually present, sometimes wanting, internal, buUiform, 

 but slightly spiral, usually not forming a single whorl ; it is con- 

 cealed under the lateral margins of the foot. 

 1. Philine, Asc. 



Shell internal, white, translucent, oval, spiral, but only form- 

 ing a single whorl ; spire rudimentary. 



1. Philine sinuata, Siim. (Fig. 54). Shell minute, ovate, pel- 

 lucid, longitudinally striate, of about one whorl ; aperture very 

 large, dilated in front. White. L. If ; D. 1 J. — Mass. ; in 4 

 fathoms. Many species of this genus, characterized by having 

 a single whorl, are found in deep water. 



Family 42. DORIDELLID/E. 



Represented only by the genus Doridella, Ver. Animal des- 

 titute of a shell, oval, smooth, convex ; dorsal tentacles retractile, 

 without sheaths ; gills tufted, posterior, on the right hand side, 

 in a groove between the mantle and the foot. 



