17- Nerita insculpta Reel. var. arata Hombron & Jacquinot. 



HOMBRON et Jacquinot. Voy. au pole du Sud. Moll. PI. i6, fig. 12, 13. 



V. Martens. Martini-Chemn. Conch. Cab. Ed. II, Nerita, p. 88, PI. 11, fig. 2, 3. 



Stat. 165. North coast of Daram-island, East coast of Misool. Reef, i Spec. 



The only specimen has on the posterior part of the last whorl only 20 ribs, as in the 

 type, on the back-side, small intermediate threads make their appearance, and become soon 

 thicker, so as nearly to equal the primary ribs; only the basal zone remains free from inter- 

 mediate ribs; the total number at the outer margin amounts to 34. The colour is darker than 

 in the figures of v. Martens, resembling the var. pacifica Reel., but the eolumellar margin has 

 only very slight indications of teeth. 



18. Nerita (Amphinerita) incerta v. d. Buseh. 



V. D. BuSCH in: Philippi, Abb. u. Beschr. neuer oder wenig gek. Conch. I, p. 85, Nerita, 



PI. I, fig. 6. 

 V. Martens. Martini-Chemn. Conch. Cab. Ed. II, Nerita, p. 83, PI. 11, fig. 19 — 21. 



Stat. I. Madura-strait, ij M. i Spec. 



Stat. 165. N. E. side of Daram-island, East coast of Misool. Reef. 16 Spec. 



This species, which was known by v. Martens only from Java and Mindanao, seems to 

 be widely distributed. I possess numerous shells from the Sangir-islands, and have seen in the 

 Leyden Museum specimens from Larantuka, one from Timor, one from the Red Sea; the 

 specimens vary in colour; that from Madura-strait is nearly typical, dark with a few white spots 

 on the back ; those from Stat. 1 65 are : 



a. dark (black or grey) with small white spots; 5 Spec. 



b. more or less dark with small white spots and 3 indistinct darker zones; 7 Spec. 



c. dark grey, with numerous much larger white spots and dark zones; 2 Spec. 



d. grey, mixed with white, dark zones very indistinct; 2 Spec. 



19. Nerita (Melatierita) argus Recluz. 



Recluz. Revue Zoologique, 1841, p. 150. 



Reeve. Conch. Ic. Vol. IX, Nerita, fig. 53. 



V. Martens. Martini-Chemn. Conch. Cab. Ed. II. Nerita, p. 93, PI. 11, fig. 17, 18. 



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



The only specimen is separated from the next species, chiefly on account of the eolumellar 

 teeth being much more conspicuous, and of the well developed granules and folds of the pillar 

 lip; the shell is however nearly smooth. 



20. Nerita (Melanerita) ocellata Guillou. 



Le Guillou. Revue. Zool. 1841, p. 344. 



V. Martens. Martini-Chemn. Conch, Cab. Ed. II, Nerita, p. 95, PI. 11, fig. 12—16. 



Stat. 19. Bay of Labuan-Tring, W. coast of Lombok. iS — 27 M. i Spec. 



