38 NERITINA. 



N. fimbria, Meusch., is a synonym. Von Martens and others 

 consider N. scmiconica a variety of N. turrita, but it appears to me 

 to have the characters of a distinct species. 



N. ROISSYANA, Recluz. PL 11, figs. 10-13. 



Conical, olivaceous or bluish white, with very close zigzag black 

 lines, often wider than the interspaces, so that the whole shell ap- 

 pears blackish; aperture bluish white, the columellar area yellow- 

 tinted. Length, 16-20 mill. 



Australia to Central Polynesia. 



Shaped like a N. turrita in miniature, but with the broad stripes 

 of that species replaced by very close zigzag lines. The synonyms 

 are N. cuprina, Reel. (fig. 11), N. chrysocolla, Gould (fig. 12), N. 

 Navigatoria, Reeve (fig. 13), N. rivula, Hombr. and Jacq., and N. 

 Vitiensis, Mousson. 



N. TURTONI, Recluz. PI. 11, figs. 14, 15. 



Orange or orange-red, often with a coppery lustre, with close, 

 undulating, oblique, broad black stripes ; aperture light olivaceous 

 or greenish white, columella bright salmon color. 



Diam. 18-25 mill. 



Viti Is., in brackish and fresh water. 



The locality, New Ireland, given by Hinds, needs confirmation. 

 The synonymy includes N. lugubris, Sowb., N. Zelandica, Recluz, 

 N. helvola, Gould, and perhaps N. mix, Brod., a unicolored brown- 

 ish shell from Tahiti. 



N. FULGETRUM, Reeve. PL 12, fig. 30. 



Shell olivaceous, with blackish maculations and tstrigatioiis ; 

 aperture whitish, columellar area orange-red. Diam. 16 mill. 



Hob. unknown* 



The direction of the pattern of ornamentation is the principal 

 difference between this species, which remains unidentified, and the 

 preceding one. 



N. COMMUNIS, Quoy and Gaimard. PL 11, figs. 16-22. 



Smooth and shining, variously solidly zoned with white, yellow 

 or purple, a portion of the banding usually overlaid with zigzag 

 oblique black stripes ; aperture bluish white, the convex columellar 

 area white or yellowish. Diam. 15-21 mill. 



East Indies, Philippines; brackish water. 



The figures which I have selected will give some idea of this 

 beautiful species, but there are besides, many other combinations of 



