44 NERITIXA. 



X. IXCERTA, Gassies. PI. 14, fig. 89. 



Solid, striate, with spiral engraved lines, whitish under a black 

 and rosy epidermis, with black lines or flames forming three bands ; 

 peristome whitish, interior white, yellowish or rosy. Alt. 13 mill. 



-V. Caledonia. 



Only known to me by the figure and description. 



X. KLLIPTICA, Guillou. Unfigured. Marquisas Is. 



Section NERITODBYAS, Martens. 1869. 



X. DUBIA, Chemu. PL 14, figs. 90-95. 



Finely, faintly striulate, without spiral sculpture, olivaceous or 

 orange-brown, with a fine or coarse pattern of zigzag black lines, 

 often interrupted to form bands, sometimes only appearing here and 

 there, or entirely absent, seldom confluent, making the entire sur- 

 face thick ; aperture bluish white, often with an orange tint near 

 the margin, columellar area usually tinted with yellow, varying to 

 orange brown, the margin edentulous. Diam. 20-27 mill. 



East Indies, Philippines, New Caledonia, etc. 



The synonyms are N. fasciata, Lam., N. lugubris, Lesson, N. reti- 

 culata, Quoy and Gaim., N. zebroides, Lesson, N. Philippinarum, 

 Sowb., ? N. vestita, Souleyet, X. bella, Busch, N. Adamsi, Issel, N. 

 atra, Lesson. 



Var. APIATA, Recluz. Fig. 95. 



Yellowish olivaceous, transversely flecked with yellowish white. 



Diam 16 mill. 



As this has heretofore been treated as a distinct species, I retain 

 it as a variety, but its characteristic markings shade off into those 

 of N. dubia, of which it is a juvenile state of growth. 



X". CORNEA, Linn. PL 14, figs. 96-100, 1. 



With low, flatly rounded riblets separated by incised spiral lines, 

 the sculpture usually faint, sometimes obsolete, yellowish brown or 

 olivaceous, generally more or less interruptedly banded and sub- 

 tessellated with black, occasionally all black; aperture whitish, 

 columellar area white, or more or less tinged with yellowish to 

 orange-brown, when white often with black blotches behind, margin 

 edentulate, varying to obsoletely minutely toothed. 



Diam. 25-42 mill. 



East Indies, Philippines, New Caledonia, Viti Is., etc. 



