NERITINA. 



Plate XXIII. 



Species 99. (Tig. a, h, Mus. Cuming.) 



Neritina spikalis. Ner. testa transvejse ovatd, tenui- 

 culd, spird parvd, parum exsertd, laterali, anfractibus 

 decussatim striatk, sidaiiffustis, ultimo mitice descen- 

 dente, aperturd oi-hiculari-ovatd, ared columellari ex- 

 cavatdj virescenle-ollvaced, sulipeUttcidd. 



The spiral Nekitina. Shell transversely ovate, rather 

 thin, spire small, but little exserted, lateral, whorls 

 decussately striated, rather narrow, the last descend- 

 ing in front, aperture orbicularly ovate, columeUar 

 area excavated ; greenish-olive, subtrausparent. 



Hai. ? 



Of a characteristic spiral growth, and of a peculiar light 



substance. 



Species 100. (Fig. a, h, Mus. Cuming.) 



Neritina striolata. 'Ner. testd snhglolosd, spird parvd, 

 oMusd, a)ifractibus convexis, coiicentrice tenid-striatis, 

 ared columellari callosd, aperturd parviiiscidd ; pal- 

 lida ciuereo-olivaced, puiiclis sparsis nigricautibus as- 

 persd. 



The finely-striated Neritina. Shell subglobose, spire 

 small, obtuse, whorls convex, concentrically iinely 

 striated, columeUar area callous, aperture rather 

 small ; pale ash-olive, sprinkled with scattered black 

 dots. 



Eecluz, Sowerby Thesam-us Conch, part 10. p. .537. 



Iliib. ? 



Of a dull Jii/punaria-Yike tone of colom', sparsely dotted 



with black. 



Species 101. (Fig. a, b, Mus. Cuming.) 



Nekitina picta. Ner. testd subglohosd, .spird obliisn, an- 

 fractibus convexis, lavibus, politis, ared cohniwllari 

 callosd ; pallide grised, carulescenle-nigro varie tt'iiiii 

 articulutd, area columellari vividc casluneo-rubrd. 



The painted Neritina. Shell somewhat globose, spire 

 obtuse, whorls convex, smooth, polished, columeUar 

 area callous ; light grey, variously finely reticulated 

 with blue-black, columeUar area bright chestnut-red. 



Sowerby, Pro. Zool. Soc. 1S33, p. 201. 



Hub. Panama (on a raud-bauk partially overflowed «ith 

 fresh water) ; Cuming. 



A beautifully reticulated grey porceUanous species, with 

 a bright chestnut-red columeUar area. 



Species 103. (Fig. u, h, Mus. Cuming.) 

 Neritina Navigatoria. Ner. testd conico-lurbinald, 

 spird promimild, anfractibus siiperne decVmbus,dcinde 

 plarw-convexis, Icevibus, ared columellari subcallosd. 



margine tciiue deuticulatd; oUvaceo-nigrd, lineis pal- 

 lidis lutescentibus, longitudinaliter undalis ornatd, 

 ared colmnellari lutescenfe. 



The Navigators' Island Neritina. SheU conically 

 turbinated, spire ratiier prominent, whorls slanting 

 round the upper part, tlien flatly convex, smooth, 

 columeUar area rather caUous, finely toothed at the 

 edge ; olive-black, painted with faiut longitudinaUy 

 waved yeUow lines, columeUar area yeUowish. 



Hab. Navigators' Island, Pacific Ocean. 



Of rather light structure for this conoidal form of spe- 

 cies, faintly closely waveil with yeUowish lines upon an 

 oUve-blaek ground. 



Species 103. (Fig. a, Mus. Cuming.) 

 Neritina pulgetrum. Ner. testd subglobosd, spird vix 

 conoided, obtusd, unfractibus superui concavis, delude 

 convexis, Icevibws, niteidibus, ared columellari callosd ; 

 vitreo-olivaced, lineis nigris transverse acute undatis 

 pulc/terrime notatd, ared columellari carneold. 

 The lightning-marked Neritina. SheO subglobose, 

 spire scarcely conoid, obtuse, whorls concave round 

 the upper part, then convex, smooth, shining, colu- 

 meUar area caUous ; glassy-olive, beautifully marked 

 with sharp transversely zigzag black lines, columel- 

 lar area carneliou. 

 llab. ? 



A smooth yellowish-oKve shell, with a striking glassy 

 polish, marked with acute transversely zigzag black lines, 

 and having a caruelion callous columeUar area. 



Species 104. (Fig. 103 b, Mus. Cuming.) 



Neritina GuAYAauiLENSis. Ner. testd ovato-globosd, 

 subdepressd, spird obtuse exsertd, anfractibus convexis, 

 dense concentrice striatis, ared columellari callosd, 

 margine tenue denticulatd ; luteo-olimced, punctis re- 

 ticulatis marmoratd, ared columellari carneold. 



The Guayaquil Neritina. Shell ovately globose, ra- 

 ther depressed, spire obtusely exserted, whorls con- 

 vex, closely concentrically striated, columeUar area 

 callous, finely toothed at the margin ; yellowish-olive, 

 mottled with reticulated dots, columeUar area carue- 

 Uon. 



D'Orrigny, Sowerby Thesaurus Conch, part 10. p. .53(1. 



Hub. llealcjos, Guayaquil. 



A somewhat obtuse deprcssly globose species, mottled 



throughout with light black-edged dots upon a bronze- 



Uke oUve ground. 



November, IS 55. 



