62 NERITINA. 



More elevated, brighter color, and not enveloping the spire like 

 the preceding species. 



N. MARCHIONATA, Reeve. PL 20, fig. 50. 



Rather thin, orbicular, shining, body whorl concavely impressed 

 next the spire, with conspicuous waved yellowish and black striga- 

 tions, sometimes nebulous; aperture yellowish, somewhat expanded, 

 columellar area rather narrow, the edge minutely toothed. 



Diam. 22 mill. 



Marquesas Is. 



Un figured Species. 



N. TRUNCATA, Sganzin. Madagascar. 



K RARA, Dufo. Seychelles. 



N. ROSSMASSLERIANA, Recluz. Hab unknown. 



Section NERITONA, Martens. 1869. 



N. LABIOSA, Sowb. PI. 21, fig. 53. 



Semiglobose, last whorl partially enveloping the spire, expanded 

 at the aperture, rugosely striate, olive brown, with short black trans- 

 verse markings; aperture large, peristome subcontinuous with the pos- 

 terior margin of the columellar area, lip and area yellowish white to 

 deep orange color, the margin edentulous. Diam. 35-50 mill. 



Celebes, Philippines. 



For operculum, see description of the section, p. 7. 



N. PLANISSIMA, Mousson. PL 21, figs. 54, 55. 



Oval, depressed, striulate, olivaceous, somewhat rough ; aperture 

 bluish, columellar area orange tinted, the margin edentulous, peri- 

 stome subcontinuous. Diam. 28 mill. 



J/fc. in Navigator's Is. 



Unknown to me, but appears very closely related to the preceding 

 species. 



N. MACGILLIVRAYI, Reeve. PL 21, figs. 56, 57. 



Depressed auriform, usually more or less eroded, smooth, brownish 

 olivaceous; peristome subcontinuous, columellar area deep orange 

 color, margin arcuate in the middle and edentulous, aperture bluish. 



Diam. 29 mill. 



Port Carteret, Solomon Is. 



