■Zoological Society. 131 



convexd, tenuiusculd, transversim crebre striatd, subepidermide 

 olivaceo-lutescente, superne earned, lineolis transversis creberrimis 

 tineas latiusculas efformantibus reticulatd ; interstitiis maculis 

 oblongo-acutis lutescentibus, superioribus interdum latioribus 

 pictd ; apice submarginali, integerrimo; aperturd ccerulescente, 

 intus croced ; labio luteo -fusee scente. 



Var. /3. Testd carneo-violacescente,fasciis nigris radiantibus, bast 

 ac later aliter ramosis, lineis transversis nullis ; aperturd intus 

 croceo maculatd ; maculd nigra late marginald. 



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

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



2. Navicella lineata, Lamarck. 



Var. y. Testd lineolis transversis tenuissimis, undulatis, creberrimis, 



olivaceis, et maculis oblongis ac linearibus, luiescentibus pictd ; 



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



radiato. 

 Hab. " Ganges, Bengal." H. Cuming. 



Nerita, Linnaeus. 



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



Gen. Neritina, Lamarck, Ferussac, &c. 



1. Nerita Siquijorensis. Ner. testd ovato-transversd, postice 

 angustatd, dorso-convexd, superne planulald, solidd, longitudi- 

 naliter tenuiter et crebre striatd, spadiceo-reticulatd, interstitiis 

 maculis oblongis, antice acutis, albidis sen lutescentibus pictd ; 

 anfractibus \\; apice retuso ; aperturd extus ovatd, intus lutes- 

 cente ; labio piano, margine et in medio vix arcuato et tenuiter 

 crenato ; labro subcontinuo, lateralibus rectiusculo. 



Var. p. Testd 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 longitudinalibus creberrimis et maculis 

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

 ginatis, subregularibus, undique pictd; anfractibus tribus sub- 

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

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

 cinerascente ; labio convexiusculo superrfe calloso, antice piano, 

 rcctiusculo et icevissime crenato. 



Var. o. Anfractu infimo depresso ; labro superne vix fornicato et 



antrorsilm jjroductiusculo ; labio postice lutescente. 

 Var. (d. Anfractu infimo dorso convexo ; labio postice 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 pictd et fasciis palfidissime interdum 

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



K 2 



