Zoological Society. 131 



convexd, tenuiusculd, transversim crebre striatd, subepidermide 

 olivaceo-lutescente, superne earned, lineoUs transveisis creberrimis 

 lineas laliusculas efformantibus reticidatd ; inlerstitiis vtaculis 

 oblongo-acutis lutescentibus, superioribiis interdum lalioribus 

 pietd ; ap'icc submarginali, i/Ucgerrimo ; aperturd ccemleseente, 

 intUs eroced ; labia litteo-fuscescente. 



Var. fi. Testa carneo-violacescente,fusciis nigris radiantibus, bast 

 ac lateraUter ramosis, lineis transversis niilUs ; aperturd intus 

 croceo maculatd ; maculd nigro late margiiiatd. 



Hab. " Island of Johanna, one of the Commoro islands; found in 

 a small stream by the Rev. W. V. Hennah." H. Cuming. 



2. Navicella lineata, Lamarck. 



Var. y. Testa UncoUs transversis tenuissimis, undulatis, creberrimis, 

 olivaceis, et maculis oblongis ac linearibus, lutescentibus pietd ; 

 apice fere marginali, subviolaceo, supra albido, Icevissime bi- 

 radiato. 



Hab. " Ganges, Bengal." H. Cumino-. 



Nerita, Linnaeus. 

 Sect. A. Labro intiis integerrimo ; labio superne nee emarginato. 



Gen. Neritina, Lamarck, Ferussac, &c. 

 I. Nerita Siquuorensis. Ner. testd ovaio-lransversd, posticl 

 angustatd, durso-eonvexd, superne planulatd, soUdd, longitudi- 

 7ialiter tenuiter et crebre striatd, spadiceo-reticulatd, inlerstitiis 

 maculis oblongis, antice acutis, albidis sen lutescentibus pietd ; 

 anfraetibus U ; apice retuso ; aperturd extus ovatd, intus lutes- 

 cente ; labia plana, margine et in medio vix arcuato et tenuiter 

 crenato ; labro subcontinuo, lateralibus rectiusculo. 

 Var. />. Testa spadiceo-reticulatd, fasciis albidis 2-3 cinctd ; labio 



externe fuscescente tincto. 

 Hab. " Isle of Siquijor, in a small stream." H. Cuming. 

 2. Nerita africana. Ner. testd ovato-conoided, subepidermide 

 nigrescente strigis nigris longitiidinalibus creberrimis et maculis 

 oblongis vel ovatis transversis, luteis, antice acutis et nigro mar- 

 ginatis, subregularibus, undique pietd ; anfraetibus tribus sub- 

 conicis ; infmo superne rugis raris notato ; spird vix prominuld, 

 apice erosd; aperturd obliqud, extus semi-oblongd, intiis albido- 

 cinerascente ; labio convexiusculo superni calloso, antice piano, 

 rectiusculo et Icevissime crenato. 

 Var. o. Aifractu infma depresso ; labro superne vix fornicato et 



antrorsum jiroductiusculo ; labia postice lutescente. 

 Var. /3. Anfractu infimo dorso convexo; labio jwstice aurantio. 

 Hab. " Island of Fernando Po, west coast of Africa; found in a 

 small stream by Capt. Downs, R.N." H. Cuming. 



3, Nerita (Clithon) Da Cost^e. Ner. testd subglobosd, supra 

 medium vix angulosd, muticd, olivaced, maculis triangularibus 

 albidis, antice acute nigris pietd et fasciis pallidissime interdum 

 obsoletis cinctd; anfraetibus quaternis plano-declivis ; spird sub- 



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