530 



centibus angulato-flexuosis picta ; spiri erosa, obliquissima ; aper- 

 tura rotundata, albido-CBerulescente ; labio angusto, planulato, in 

 medio vix arcuato et crenulato ; labro supeme subarcuato, anterius 

 subtruncato." 



Of a globose form, thin, with zigzag lines on a greenish-brown 

 ground ; aperture rounded, with the inner lip narrow, scarcely 

 arched in the middle, and crenulated. 



Panama. Cuming. 



77. Neritina picta (pi. cxvi. f. 267-269), Sowerby, senr., 

 Pro. Zool. Soc., 1832, p. 201. 



"N. testa subglobosa, cinerascente, maculis, sphacelis vittisque 

 diversimodo picta; labio interno castaneo." 



Subglobose, greyish, variously painted with black lines or reti- 

 culations and whitish spots. There is a peculiar enamel-like ap- 

 pearance about the external surface ; the columella is invariably of 

 a chestnut colour, rather swelled, and obscurely crenulated at the 

 margin. 



Panama ; on a mud-bank, partially overflowed with fresh water. 

 Cuming. 



78. Neritina faba (pi. cxv. f. 219-221), Sow., Con. 111. f.10. 



N. testa subquadrato-globosa, laevigata, rufescente, fasciis trans- 

 versis nigris, vel fasciis obliquis viridibus vel violaceis, et interstitiis 

 flavidis varie picta ; spira parva, anfractu ultimo obtuse angulato ; 

 labio externo antice subproducto, superne subelevato ; labio interno 

 minute crenulato, vix arcuato. 



Resembling N. picta, but with the columella neither swelled 

 nor of a chestnut colour, and the spire rather more hidden. 



79. Neritina pulchella (pi. cxv. f. 209-211), Recluz, MS. 



N. testa N.faba simili, sed quasi-subcyhndrica, minute picta; 

 apertura subcontracta. 



There is a peculiar cylindrical character in the form of this 

 species, and the aperture is, as it were, drawn in all round. We 

 have varieties of a dark green, reddish, or brownish ground, 

 minutely grained with white specks. 



Island of Luzon; on stones in a small stream. Cuming. 



80. Neritina pupa (pi. cxi. f. 68, 69, pi. cxv. f. 212), Linn. 

 Syst. Nat. p. 1253. N. tristis, jyOrbigny, inclusa. 



N. testa, oblique ovali, lsevi, alba, lineis nigris longitudinalibus 



