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6. Nerita (Theliostyla) patuia Recluz. 



Recluz. Revue Zool. 1841, p. 148. 



REEVE. Conch. Ie. Vol. IX, Nerita, fig. 84. 



V. Maktens. Martini-Chemn. Conch. Cab. Ed. II, Nerita, p. 52, m, PI. 7, fig. 8 — 13. 



Stat. 33. Bay of Pidjot, Lombok. 22 M. 1 Spec. 



Stat. 47. Bay of Bima, near South fort. Shore. 1 Spec. 



v. Martens (l.c. p. 1 1 1) is in doubt if his patuia is the same species as that of Recluz, 

 as this author describes it, as having and epidermis and a smooth operculum, with a striated zone 

 at the outer margin, like N. polita. I have often met with in collections, shells of Nerita with 

 a false operculum, especially if bought from dealers. Both specimens of the Siboga collection, 

 have the operculum as v. Martens describes it; that from Stat. 33 has the darkest shell. 



As to an epidermis, the specimen of Stat. 33 is smoother than that of Stat. 47, and seems 

 to have a very thin epidermis; the sculpture forms a passage to the var. Beaniana Recluz, the 

 specimen from Stat. 47, agreeing in shape better with the figures of v. Martens. 



7. Nerita (Cymostyla) maxima Chemnitz. 



Chemnitz. Conch. Cab. V, p. 287, PI. 190, fig. 1942, 1943. 



REEVE. Conch. Ie. Vol. IX, Nerita, fig. 18. 



V. MARTENS. Martini-Chemn. Conch. Cab. Ed. II, Nerita, p. 29, PI. 6, fig. 1 — 5. 



Stat. 279. Roma. Reef. 1 1 Spec. 



Stat. 296. Off Noimini, South coast of Timor. Reef. 1 Spec. 

 'Java. 2 Spec. 

 *Amboina. 2 Spec. 



8. Nerita (Cymostyla) semirugosa Recluz, var. subglobosa Martens. 



Recluz. Revue Zool. 1841, p. 102 {semirugosa). 



REEVE. Conch. Ie. Vol. IX, Nerita, fig. ija, Ij (maitra). 



v. Martens. Martini-Chemn. Conch. Cab. Ed. II, Nerita, p. 31, PI. 6, fig. 9; PI. 1, fig. 5, 6. 



Stat. 80. Borneo-bank. 50 — 40 M. 1 Spec. 



By the higher spire, this specimen belongs to the variety stièglobosa Mart., it agrees 

 also in colour, very well with his fig. 9. 



9. Nerita (Cymostyla) undata Linné. 



Linné. Syst. Nat. Ed. X, p. 779, N" 645. 



RUMPH. Amb. Rariteitkamer, p. 79, PI. 22, fig. 4. 



Reeve. Conch. Ie. Vol. IX, Nerita, fig. 15^ [Le Guillouana). 



V. MARTENS. Martini-Chemn. Conch. Cab. Ed. II, Nerita, p. 34, PI. 6, fig. 10 — 16. 



Stat. 19. Bay of Labuan Tring, West coast of Lombok. 18 — 27 M. 6 Spec. 

 Stat. 50. Bay of Badjo, West coast of Flores. Up to 40 M. 9 Spec. 

 Stat. 64. Kambaragi-bay, Tanah Djampeah. Reef. 5 Spec. 



The specimens vary much in colour, from nearly white to very dark, both extremes live 

 in the same localities. 



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