106 Mr. A. Hancock on the Animal of Chamostrea albida. 



2. Cyclostoma orophilum, nobis, n. s. 



Testa anguste umbilicata, globoso-conica, sub epidermide non nitente 

 olivacea, albida, versus apicem acuminatum uigrescente ; spira 

 elevata, conica, attenuata, sutura distincta ; anfractibus 5, convexis, 

 ultimo rotundato, lineis 9 elevatiusculis, subtus remotioribus mu- 

 mto ; apertura parum obliqua, circulari ; peristomate tenui, recto, 

 anfractui penultimo breviter adnato, labio expansiusculo ; umbilico 

 non pervio. 



Diam. major 9, minor 7, alt. 7^ mill. 



Hub. ad MouahagaUa vicum montanum interiorem Insulse Ceylon. 

 Teste Edgar L. Layard. 



Allied to the Point de Galle C. halophilum, nobis, but differ- 

 ing in sculpture and in the acuminated spire. It belongs to 

 Leptopoma of Pfeiffer. 



3. Cyclostoma liricincium, nobis, n. s. 



Testa depressa, orbiculata, albida, liricincta, ad intervalla radiato- 

 striata ; spira \ix elevata, apice obtuso, suturis excavatis ; anfrac- 

 tibus 3-i- couvexiusculis, ultimo rotundato, liris 8 cincto ; apertura 

 subcirculari, oblique superne angulata ; peristomate recto, acuto ; 

 umbilico lato, perspective. Operculo corneo, tenui, multispirato. 



Diam. major 4, minor 3^, alt. 2 mill. 



Hab. ad oras Australise Occidentalis. Dr. J. F. Bacon. 



The penultimate whorl shows three elevated lines which are 

 diminished to two in the upper whorl. Its place seems to be in 

 Pfeiffer's 1 0th section of Cyclopkorus. 



4. Cyclostoma orbiculatum, nobis, n. s. 



Testa depressa, orbiculata, albida, oblique striata, liris nonnuUis, prse- 

 cipue subtus, munita ; spira elevatiuscula, sutura excavata, margi- 

 nata, exUiter striata ; anfractibus 4, convexis, ultimo rotundato ; 

 apertura subcirculari, obliqua, superne angulata, subcanaliculata ; 

 peristomate simplici ; umbilico aperto, perspective. Operc. ? 



Diam. major 3i, minor 3, axis 2 mill. 



Hab, cum praecedente. 



Malvern, January 4, 1853. 



X. — On the Animal of Chamostrea albida. 

 By Albany Hancock, Esq. 



[With Two Plates.] 



Having been favoured by John Whichham Flower, Esq. of 

 Croydon, with a specimen in spirits of Chamostrea albida, — the 



