NERITINA. 



Species 39. (Fig. a, h, Mus. Cuming.) 



Neritina zebba. Ner. testa ovatd, spird parvd, e.vsertd, 

 mifmcti/jt/s snpeme decUvibus, deinde convexis, area 

 columellari acute decUvi, margbie ii/imife denticidatd ; 

 niijrd, I'meis fidvis ol/lir/iie lo/dii/is loiigitndiiialiler 

 Htriijutd. 



The zebra Neritina. Shell ovate, spire small, exserted, 

 whorls slanting round the upper part, then convex, 

 columellar area sharply slanting, minutely denticu- 

 lated at the edge ; black, striped with obliquely 

 waved longitudinal yellow lines. 



Lamarck, Anim. sans vert. vol. viii. p. .57'l. 



Hab. Tahiti. 



An ovate species, with a small obtruded spire, obliquely 



longitudinally striped with yellow linos upon a black 



ground. 



Species 40. (Fig. «, h, Mus. Cuming.) 



Neritina sobrina. Ner. testd compresse fflobo.sd, spird 

 obiiisd, vix exsertd, anfractihm siiperne dccliribiis, 

 siibanffiisfis, snbtits planatis, lavib/is, area cuhimeUarl 

 callosd, nxbveriicaU ; Inteo-oUvaced, striylt m/dalis 

 siibdistantibiis pictd. 



The allied Neritina. Shell compressly globose, spire 

 obtuse, scarcely exserted, whorls slanting roimd the 

 upper part, rather narrow, flattened beneath, smooth, 

 columellar area callous, rather vertical; yellowish- 

 olive, marked with rather distant zigzag black streaks. 



Reoluz, Sowerby, Thesaurus Couch, part 10. p. 536. 

 pi. 113. f. 100. 



JIab. ? 



Of a peculiar obtuse flatly slanting growth about the 

 spire, descending vertically beneath. 



: 41. (Fig. a, b, ]\Ius. Cuming.) 

 Neritina Cumingiana. Ner. testd pyramidali-conicd, 

 spird ampld, erecid, anfractihm superne plano-decU- 

 vibus, basi convexis, area colmnellari callosd ; vires- 

 cente-nigrd, lineis albis tenuibus lomjitndimtliter imdu- 

 latis uiidiqiie notatd, area columellari earmold. 

 Cdming's Neritina. Shell pyramidally conical, spire 

 large, erect, whorls flatly slanting round the upper 

 part, convex at the base, columellar area callous; 



greenish-black, marked throughout with fine longi- 

 tudinally waved white lines, columellar area carne- 

 liou. 



Recluz, Eevue Zool. Soc. Cuvierienne, 1842, p. 77. 



Hab. Island of Siquijor, Philippines (on stones in moun- 

 tain streams) ; Cuming. 



This fine species is weU characterized liy its solid erect 

 pyramidal form. 



Species 43. (Fig. n, b, Mus. Cuming.) 



Neritina S.miteii. Ner. testd globosd, solidd, spirdsnb- 

 cuiiicu, (iiij'ractibiis siiperiie in/jux'sso-plaiiatis, deinde 

 rot Hilda lis, leecibns, area colioiiellnri callosd ; carules- 

 crtiti'-albd, fasciis niyris liiieisqne capillaribus inter- 

 niptis irreytdariter longitudiHaliter pictd, ared colu- 

 mellari sangidneo-tinetd. 



Smith's Neritina. Shell globose, soUd, spire sub- 

 conical, whorls irapressly flattened round the upper 

 part, then rounded, smooth, columellar area callous ; 

 bluish - white, painted with irregular interrupted 

 longitudinal black bands and hair-lines, columellar 

 area blood-stained. 



Gray, Sowerby, Conch. Illus. Neritina, f. 30. 



Hab. Banks of the Ganges, Calcutta. 



Distinguished by its peculiar mottled grey painting and 

 porcelain-like substance, and characferistic blood-stain on 

 the columellar area. 



Species t3. (Fig. a, b, Mus. Cuming.) 



Neritina morio. Ner. testd ovatd, spird parvd, iinpressd, 

 aiifractibus supeme plaHO-declivibus, subangnstis, ared 

 colnmellari acute concavd ; intense carbonarid, ared 

 colmnellari lutesceule. 



The pool Neritina. SheU ovate, spire small, impressed, 

 whorls flatly slanting round the upper part, rather 

 narrow, columellar area sharply concave ; deep coal- 

 black, columellar area yellowish. 



Sowerby, Pro. Zool. Soc. 1833, p. 201. 



Hab. Ducie's and Easter Islands, South Seas (on coral 

 reefs) ; Cuming. 



This species, partaking of the marine character of 

 Nerita, is perhaps more strictly referable to that genus. 



