54 AMERICAN MARINE CONCHOLOGY. 
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 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. 1862. 
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 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. 
Synopsis of Genera. 
Shell convolute, smooth, inner lip crenulated. PorcELLANA, Rumph. 
Shell covered with transverse ribs, inner lip erenulated. Trrvra, Gray. 
Shell smooth, each end produced into a canal; inner lip smooth, outer lip 
reflected, thickened externally. Vouya, Bolten. 
