54 AMERICAN MARINE CONCIIOLOGT. 



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

 confluent in longitudinal lines. Lip white, thickened, obtusely 

 reflected, slightl}- 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 M. 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. 1803. 

 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 may be distinguished from one or two other minute species 

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



Family PORCELLANID^. 



Shell convolute, enamelled ; spire concealed ; aperture narrow, 

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

 No operculum. 



Animal with abroad 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 ; e3'es 

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

 single. 



Synopsis of Oenera. 

 Shell convolute, smooth, inner lip crenulated. Porcellana, Kumph. 

 Shell covered with transverse ribs, inner lip cjenulated. Trivia, Gra}-. 

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

 reflected, thickened externally. Volya, Bolten. 



