26 



Vitkina Ruivensis (Couthouy ]\IS.) Testa haliotiformis, 

 transverse subquadrata, depressa, papyracea, pcllucida, nitida, 

 chlorata, gradibus setatis striata : spira vix conspicua, anfr. uno 

 rapide crescente ; apicc latcrali : apertura faciem inferiorem ade- 

 quans ; labro prope spiram mcmbranacco ; columella laxe intro 

 spiram volvente ct cam penitus exhibente. Lat. f J, alt. 5 4 - poll. 

 Halt. Madeira, near the summit of Pico de Ruivo, 6210 feet al- 

 titude. A very large and well-marked species. 



Viteina nitida. Testa depresso-globosa, heliciformis, tenu- 

 issima, pellucida, nitidissima, laevigata, succineo-viridis, imperfo- 



rata : spira anfr. 4 convcxis, ultimo amplo ; apice subcentrali, 

 prominente ; sutura excavata : apertura transversa, subcircula- 

 ris ; pcristomale inflexo ; columella arcuata, usque ad apicem 

 perspicua. Diam. |#, alt. ,'0 P°'-- Hab. Madeira, Roche de 

 Empena, 4240 feet elevation. A most elegant and brilliant 

 species. 



Vitrina cArERATA. Testa helicoidea, depresso-globosa, ad 

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

 talibus conspicuis et rugis obliquis ramulosis, prsecipue supernis, 

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

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

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

 everso ; columella, callum simulantc, secundum spiram intro- 

 eunte. Diam. max. 2 9 ff , alt. -J poll. Hab. 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. Testa sigaretiformis, tenuis, sub-opaca, 

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

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

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

 tica; labro plerumque membranaceo. Diam. \ §, alt. j 7 - poll. 

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



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

 The animal is still more decidedly different. 



Vitrina tenella. Testa parva, V. pellucida simillima, suc- 

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



