NERITINA. 57 



orange band parallel with the ouler lip, coluniellar area flattened, 

 polished, very minutely punctate, greyish black varying to yellow- 

 ish olivaceous, edge very minutely dentate. Diam. 40 mill. 



East Indies, Australia, Central Polynesia. 

 N. rubella, JNIiiller, N. larga, Hombr. et Jacq. (fig. 9) N. conglo- 

 bata, Martens (figs. 22, 24), and vars. sulcata, T. Woods, and sub- 

 ■canalis, Mouss. are synonyms. 



Var. Knorri, Recluz. Figs. 16-18. 



Smaller than N. piUligera, body whorl without the sutural ridge, 

 but extending over the sj^ire, which it completely covers, epidermis 

 jet black, unicolored; aperture bluish with an orange band within 

 the margin, coluniellar area violaceous, the edge minutely toothed. 



Diam. 28 mill. 

 E. Africa, Mozambique to Madagascar; Ins. Labuan, near Borneo? 



It is N. Beckii, Sowb., (fig. 17), and N. cryptospira, Martens 

 (fig. 18), from the last named locality. 



Var. CANALis, Sowb. Figs. 6, 7. 



Epidermis black, or very dark brown punctate or minutely retic- 

 ulated with black ; aperture varying from bluish to yellowish, colu- 

 mellar area yellow becoming reddish orange posteriorly, edge very 

 minutely dentate, or smooth. Diam. 20-30 mill. 



Australia, New Caledonia, Viti Is. 



Typically distinguishecl by its strong sutural ridge and interven- 

 ing channel, but from this character insensibly merges into the 

 parent form; the coloring of the coluiuellar region also, varies to 

 that of N. pulligera through intermediate shades. 



N. bicanalis, Phil, is a synonym. 



Var. ovALis, Sowb. Fig. 8. 



More transverse, with terminal apex, spirally striated, aperture 

 yellowish, deepening to orange color on the coluniellar area, edge 

 very obscurely crenulated. Diam. 25 mill. 



Tahiti. 

 Var. Petitii, Recluz. Figs. 12, 15, 19. 



Striate, body whorl somewhat extended above, but not covering 

 the spire, and appressed, not ridged, dark brown, faintly black- 

 spotted, varying to black ; aperture and columellar area yellowish 

 to orange, columellar edge minutely dentate or smooth. 



Diam. 30-40 mill. 



Indo- Australian, Central Polynesian. 



