NERITINA. 



Plate XVIII. 



S])ccies 81. (Fig. a, h, c, d, Mus. Cuming.) 



Nekitina aculeata. Ner.tfdddqiresso-ovatd, tenid, .yiird 

 oblique iutortd, planatd, anfractihus convexis, xplru- 

 Uier liratis, lirii sernitk vel acnleatk, ared cdmacl- 

 lo.ri siiperficicditer excavatd ; sordide fused, corin-d. 



The prickly Neritina. Shell depressly ovate, thin, 

 spire oblicpiely turned inwards, flattened, wliorls con- 

 vex, spirally ridged, ridges serrated or ])i-ickly, co- 

 lumellar area superficially excavated ; dull brown, 

 horny. 



Gmelin, Syst. Nat. loth edit. p. 3GS6. Cheniiiitz, Couch. 

 Cab. vol. X. pi. ir.!l. f. 1643. 

 Xeritiiia micatu, Nyst. 



Unit. Sumatra. 



(Jf a distinct subgeneric type, thin and hi 

 auce, partaking of the character of Fuliidoi,/ 



sub- 



Nei 



Species 85. (Fig. a, h, Mus. Cumiug.) 



Neritina Floridana. Ner. testd compreiso-ijlohom., so- 

 lidiiisculd, spird obtusd, mifractihm s/ijicn/i jjlmdus- 

 rnlis, ared columellarl callosd ; virescenfc-alhd, Uneis 

 olivaceis siiltlUssimis dense eleymile)' pictd. 



The Florida Neritina. Shell corapressly globose, ra- 

 ther solid, spire obtuse, whorls rather flattened at the 

 upper part, coluniellar area callous ; greenish-white, 

 densely elegantly painted with very fine olive lines. 



Shuttlewokth, MS. Mus. Cumiug. 

 Neritina recUvata, var., Sowerby. 



Hub. Florida. 



Closely allied to Neritina redivata, from ivhieli it 



scarcely differs except in being of a more stunted growth. 



ipeeies 80. (Fig. ,/, i, Mus. Cuming.) 

 depressa. Ner. testa comjjressii oratd, snlidi- 



iisciild, spird oblique intortd, anfractihus nni/uslis, ro- 

 tniidiitis, deciissatiin minntr sfriatis, ared colnmellnri 

 (unpld, ninrfine continao ; olivaceo-fuscd, ptiis minux 

 rarieijatd, npertnrd curneold. 



The depressed Neritina. Shell compressly ovate, 

 I'ather solid, spire obliquely turned inwards, whorls 

 narrow, rounded, decussately minutely striated, co- 

 lumcUar area large, with the margin continuous ; 

 olive-brown, more or less variegated, aperture carne- 

 lion-tinged. 



Benson, JIS. Mus. Cuming, 'y^ 



ITab. Calcutta. 



Of a solid Crepididit-XxVit form, with an expanded con- 

 tinuous aperture. 



Species 87. (Fig. a, b, Mus. Cuming.) 



Neritina Cuvieriana. Ner. testd ocato-rjlobosd, solidi- 

 iiscutd, spird sutjprominuld, anfraclibus rotundatis, 

 t/eribits, ared columellari .vibantjHstd ; olivaceo-nigrd, 

 luteo piuwtatd et variegatd. 



Cuvier's Neritina. Shell ovately globose, rather solid, 

 spire slightly prominent, whorls rounded, smooth, 

 columellar area rather narrow : olive-black, dotted 

 and variegated with yellow. 



Eecluz, Bevue Zool. Soc. Cuvierienue, 1841, p. :i38. 



Hub. New Ireland. 



Of simple form, but varying considerably in painting. 



iber, 18.53 



