511 



externo superne extenso, ad apicem in costam elcvatam producto, 

 interne aurantio; labio interno cinereo, callo arcuato, in medio 

 complanato, ad marginem leviter dentato, vix arcuato. 



Transversely oval, with large aperture, and no spire, the outer 

 lip elevated into a ridge above the apex. The inner lip is broad 

 and flat, with an elevated callus on the body-whorl ; its inner edge 

 is scarcely curved, and very slightly dentated. The external sur- 

 face is covered with a dark olive epidermis ; the columella is ash- 

 coloured, and the inside of the outer Hp orange. 



Molluccas; Lam. Cagayan, Misarnis, Island of Mindinao, 

 Philippines, on stones in a deep river ; Cuming. 



14. Neritina Powissiana (pi. cxiii. f. 149), Reeluz, MS. 

 Mus. Cum. 



N. testa, transverse ovata, laevigata, fasciis alternatim interruptis 

 picta ; spira celata. ; apice depressa ; apertura magna, alba ; labio 

 externo superne extenso, ad apicem in costam elcvatam producto ; 

 labio interno complanato, margine lsevi. Operculo rubro-nigricante. 



A very pretty little shell, resembling N. pulligera in form, but 

 narrower, with the outer surface marked by alternately interrupted 

 bands of red and black ; the mouth white, and the inner bp free 

 from callus, and not dentated. 



New Ireland ; in a mountain stream, on stones. Hinds. 



15. Neritina Knorrii (pi. cxi. f. 78, pi. cxiii. f. 150), 

 Becluz, Eev. Zool., 1841, p. 274. 



N. testa N. pulligera simillima, sed transverse plus elongata, 

 labio externo ad apicem decumbente. 



Rather longer in the transversely oblicpie direction than N. 

 pulligera (Sp. 13) ; and the upper part of the outer bp not raised 

 into a ridge as in that species. 



Island of Negroes ; in a mountain stream, on stones. Cuming. 



16. Neritina Petitii (pi. cxi. f. 77), Reeluz, Eev. Zool., 

 1841, p. 373. 



N. testa N. pulligera simib, sed apertura, fusca, margine superne 

 et inferne rotundato. 



Similar to N. pulligera (Sp. 13), but the edge of the aperture 

 rounded and confluent; the mouth is deep, and of a brown 

 colour. 



Island of Mindinao, Philippines ; on stones in a deep river. 

 Cuming. 



3 u 2 



