54 AMERICAN MARINE CONCIIOLOGY. 



with white ; towards and upon the spire the white spots tend to be 

 confluent in longitudinal lines. Lip white, thickened, obtusely 

 reflected, slightly denticulated within, with three external brown 

 spots. Spire moderate, four whorls visible, the last one shouldered 

 beneath the suture ; columella four-plaited. 

 Length 14, diam. 8 mill. 



North Carolina to Georgia. 



Resembles 31. apicina of West Indies, but distinguished by the 

 white flecked lines; the spire is also more developed and body 

 more angular. 



3. M. LACHRYMULA, Gould. 



Proc. Bost. Soc. Nat, Hist., viii. 281. 18(52. 



Shell small, ovate, white, translucent, shining, very finely longi- 

 tudinally striate ; apex scarcely prominent, vitreous ; aperture nar- 

 row, crescentic ; lip obtuse, varicose without and widely arcuate 

 behind, crenulate within ; columella four-plaited. 



Length 1.5, diam. 1 mill. 



Dredged in 400 fathoms. 



Coast of Georgia. 



This ma} r be distinguished from one or two other minute species 

 found in the W. Indies by its transparency and its ventricose form. 



Family PORCELLANID.E. 



Shell convolute, enamelled ; spire concealed; aperture narrow, 

 channelled at each end ; outer lip of adult thickened, inflected. 

 No operculum. 



Animal with a broad foot, truncated in front ; mantle expanded 

 on each side, forming lobes, which meet over the back of the shell ; 

 these lobes are usually ornamented with tentacular filaments ; eyes 

 on the middle of the tentacles or near their base ; branchial plume 

 single. 



Syno2)sis of Genera. 

 Shell convolute, smooth, inner lip crennlated. Porcellana, Rumph. 

 Shell covered with transverse ribs, inner lip crennlated. Trivia, Gray. 

 Shell smooth, each end produced into a canal ; inner lip smooth, outer lip 

 reflected, thickened externally. Volva, Bolten. 



