﻿VANIKORO.— Plate IH. 



aperturd semirotundd ; columelld tenui, recliasculd ; 



canali elongato, angnsto. 

 The half-platted Vanikoro. Shell globose, rather 



tliin, finely decussated ; last whorl raised above 



the suture of the aperture ; apical whorls minute ; 



aperture half-round ; columella thin, rather 



straight ; canal long, narrow. 



Pease ? MS. in Cuming's Collectiou. 



Hah. South Seas 



Species 23. (Mus. Brit.) 



Vanikoro elata. Van. testa altd, tenui, tenuissime 

 (lecussatd; spird elevatd, acuminatd, anfractibus 

 prominentibus ; aperturd hreviusculd, Buhpyrifonni ; 

 columelld brevi, leviter arcuatd, canali brevi, angus- 

 tissimo. 



The elevated Vanikoro. Shell elevated, thin, very 

 finely decussated ; spire elevated, acuminated, 

 whorls prominent ; aperture rather short, rather 

 pyriform ; columella short, slightly arched, canal 

 short, very narrow. 



SOWERBY. 



Hab. China Seas. 



j\Iuch more elevated than Vanikoro acuta, and with 

 narrow canal. 



Species '24. (Fig. a, b, Mus. Brit.) 

 Vanikoro semisoluta. Van. testa altd, angustd, spira- 

 liter costis moniliformibus, et concentric'e striis 

 tenuibus sculptd ; spii'd elevatd, acuminatd ; ultimo 

 anfractu suprd, suturam perelevato ; aperturd 

 decHvi, anguste auriformi, ad suturam vix convexd, 

 canali elongato, latiusculo. 

 The half-uncoiled Vanikoro. Shell elevated, 

 narrow, sculptured spirally with beaded ribs, and 

 concentrically with thin strias ; spire elevated, 

 acuminated ; last whorl raised high above; the 

 suture ; aperture sloped downwards, narrowly 

 auriform, scarcely connected at the .suture, canal 

 elongated, rather broad. 



SOWERISV. 



nab. East Indies. 



Owing to the fall of the aperture and the compara- 

 tive distinctness of the canal, the outer and inner lips 

 seem scarcely to touch the body-whorl. 



N E R I T P S 1 S. 



Genus NERITOPSIS, Gratetmpe. 

 Testa subglobosa, spiraliter granoso-costata ; spira hrevi, 

 apertura magna ; labia interna crasso, plamdato, 

 medio quadratim emarginato ; labia externa i7itiis 

 incrassato. Operculum crassiun, testaceum, non- 

 spirale. 

 Shell subglobose, spirally granulately ribbed ; spire 

 short, apertiu-e large ; inner lip thick, flattened, 

 with a square notch in the middle ; outer lip 

 thickened within. Operculum thick, shelly, not 

 spiral. 

 Syn. Radula, Gray, not Klein. 



As yet the Neriiojjsis radula from tlie Pacific is the 

 only recent species known, although there are many 

 fossil ones. The operculum formerly imknowii, and 

 supposed to be thin and horny, has been recently 



figured in the Zoological Proceedings and described by 

 Mr. Henry Adams. It is thick and shelly, with a 

 square projection to fit the notch in the columella of 



the shell. 



Species. (Mus. Sowerby.) 



Neritoi'Sis radula. Ner. testa oblique ovatd, crassd ; 

 costis crassis monilifoi-mibus spiralibus scul^ttd ; in- 

 terstitiis angustis, foveolatis ; aperturd obliqud, 

 margine externo laqueato. 



The root Neritopsis. Shell obliquely ovate, thick ; 

 sculptured with thick beaded, spiral ribs; inter- 

 stices narrow, pitted ; aperture oblique, outer 

 margin fluted. 



LiNNiEus {Kerita). Syst. Nat. 



Hah. Cevlon. 



