60 NERITINA. 



K POBCATA, Gould. PL 20, fig. 35. 



Eqtially, closely plicate, epidermis dark brown with inconspicuous 

 black reticulations, varying to entirely black, last whorl appressed 

 on the spire, which is partially covered ; aperture yellowish with a 

 deeper zone around the margin, columellar area flattened, minutely 

 punctate, yellow* deepening into orange red posteriorly, margin 

 minutely dentate. Diam. 18-27 mill. 



Viti and Samoan If. 



It is A 7 . Solomonensis, Reeve, N. Graffei, and Var. frondosa, 

 Mousson. 



N. SULCULOSA, Martens. PI. 20, fig. 36. 



Closely spirally engraved, striulate, dark olivaceous brown, with- 

 out markings ; aperture bluish ash color, columellar margin sinuated, 

 distinctly rather strongly dentate, area plane. Diam. 14 mill. 



Ins. Flores, E. of Java. 



Is N. spiral is, Martens, not Reeve. 



N. PUNCTULATA, Lam. PL 20, figs. 37-41. 



Nearly 'smooth, the strise of growth fine and inconspicuous, last 

 whorl enveloping the spire, light brown, sometimes with a violet 

 tinge, varying to black, covered throughout with close light colored 

 suboval spots; aperture bluish white, varying to light yellowish, 

 columellar area wide, flattened, minutely punctate, yellowish grey, 

 edge minutely dentate. Diam. 20-30 mill. 



West Indies, Central America, New Grenada, Bay of Montija, 

 Panama to Mazatlan. 



Probably inhabits the sea as well as fresh water; some of the 

 -specimens have the spire extensively eroded. The distribution on 

 both shores of the American continent is singular, but is well- 

 established. The species need not be confounded with N. virginea, 

 Linn., as has been done; in its spire-enveloping body whorl and 

 other characters it is very distinct from that species, and completely 

 indemnified with the present group. 



The principal synonym is N. cassicidum, Sowb. (fig. 39), which 

 von Martens by an erroneous reference to Sowerby's illustrations 

 has referred to N. reclivata, Say ; other synonyms are N. fuscilabris, 

 Wiegmann; and N. aperta, Budgin. I think that to these may pro- 

 bably be added N. Bahiensis, Recluz (fig. 40), from Brazil, and 

 N. turbida, Morel et (fig. 41), from Central America both of them 

 young shells. 



