181 



ViTRiNA CAPERATA. Testa helicoidca, depresso-globosa, ad 

 peripheriam obtuse angulata, tenuis, sub-opaca, striis incremen- 

 talibus conspicuis et rugis obliquis ramulosis, prsecipue supernis, 

 exarata, dilute fulvo-cornea, arete perforata : spira anfractibus 

 3^ convexis, cito crescentibus ; sutura, profunda ; apice subcen- 

 trali : apertura sub-circularis ; labro simplici, ad umbilicum 

 everso ; columella, callum sinnulante, secundum spiram intro- 

 eunte. Diam. max. 2^^, alt. ^ poll. Hah. Kauai, Sandwich 

 Islands. 



A large and substantial species, easily distinguished by the 

 branching wrinkles of the surface, which perhaps answer to 

 blood-vessels. 



ViTRiNA MARciDA. Tcsta sigarctiformis, tenuis, sub-opaca, 

 flavo-viridis, depresso-orbicularis, tenuiter striata, sub-perforata : 

 spira anfr. ad 3, convexiusculis, ultimo ample, declivo ; apice 

 sub-centrali ; sutura bene impressa : apertura transversa, ellip- 

 tica ; labro plerumque membranaceo. Diam. f §, alt. -^^ poll. 

 Hab. Madeira, Roche de Empefia ; height of 4200 feet. 



Differs from V. Lajnarckii, especially in having more whorls. 

 The animal is still more decidedly different. 



ViTRiNA TENELLA. Tcsta parva, V. peliucidcB simillima, suc- 

 cinea, sub-perforata, gradibus aetatis conspicuis striata : spira 

 rotundata, apice subcentrali, anfr. 3, convexis, declinantibus ; su- 

 tura excavata : apertura sub-circularis ; labro antrorsum arcuata. 

 Diam. 4-, alt. ■^\ poll. Hai. Kauai, Sandwich Islands. 



It is larger than V. pelliicida, more opaque, and the aperture 

 is larger. 



ViTRiNA ROBUSTA. Testa helicoidea, transversa, depresso-glo- 

 bosa, sub-valida, polita, perlucida, dilute flavo-viridis, lineis in- 

 crementalibus regularibus, obtusis, striata : spira obtusa, anfr. 

 3, ultimo magno ; apice subcentrali ; subtus rotundata : apertura 

 rotundata ; margine sinistro superne reflexo, rimam umbilica- 

 lem parvum formante. Diam. max. ^, alt. ^ poll. Hab. New 

 South Wales. 



This is about the size and form of V. nigra^ Quoy, and is 

 almost exactly like V. Freycineti, Fer. It is more globose and 

 brilliant than V. marcida^ and seems to be built more firmly than 

 any other species. 



