517 



33. Neritina obtusa (pi. cxi. f. 72, 73), Benson. 



^ N.^testa transverse ovali, leviter striata, epidermide subviridi 

 induta; spira depressa, anfractibus duobus ; apertiira magna, sub- 

 cinerea; labio externo interne crassiusculo ; labio iuterno com- 

 planato, recedente, margine sinistro oblique acuto, margine dextro 

 m medio subarcuato, subcrenulato. Operculo cinereo. 



Transversely oval, slightly striated, covered with a dingy olive 

 epidermis. The spire is rather fiat, consisting of two whorls ; the 

 body-whorl and aperture is very large. The left margin of the 

 columellar lip presents a sharp keel half-way up ; the right margin 

 slightly arcuated and crenulated in the centre. The inner edge 

 of the outer lip is thickened inside. 



Banks of the Ganges, Calcutta. 



34. Neritina Panayana (pi. cxv. f. 191). 



N. testa iV. obtusa simili, sed liueis griseis minute angulatis 

 picta ; labio externo magis expanso ; labio interiio concavo, mar- 

 gine Isevigato. 



Differing from N. oUusa (Sp. 33) in the outer lip being more 

 spread at the upper part, and in the columella being smooth at 

 the edge and rather hollow. The outer surface is covered with 

 zigzag Hnes. 



River Dingle, Island of Panay j on small stones. Cuming. 



35. Neritina dubia (pi. cxi. f. 81-88), Chemn. Conch. 

 5. pi. 193. f. 2019, 2020. N. reticulata, Q.uoy et Gaimard. N. 

 zebra, Chemn. t. ix. p. 69. pi. 124. f. 1380. N. zebroides, Lesson. 

 N. Philippmarum, Sowerb/s Conch. 111. N. fasciata, Lamarch, 

 bowerby. Conch. 111. f. 35. N. beUa, Busch, Phil. Abbild. t. 1. f. 8. 



N. testa transverse subovali, subtenui, fusca vel pallide fulva, 

 fascus et maculis nigris varie picta; spira rotundata, anfractibus 

 tnbus; apertura interne ad extremitates subcarmata; labio externo 

 intiis incrassato ; labio interno complauato, leevi, plerumque fusco. 

 Operculo griseo. 



Rather oval transversely, rather thin, brown, with various black 

 markings; spire rounded, with three whorls; apertui-e with a 

 small raised edge within, at each extremity; and the inside of the 

 outer hp with a slight thickening. The inner hp is flat and 

 smooth. 



River Pisag, Bay of Manilla; adhering to the piles of wharfs. 

 Cuming. 



3x 



