18C8.] MR. NEVILL ON THE LAND MOLLUSKS OF MAURITIUS. 257 



symptom of albinism, being lively, and using its eyes in the brightest 

 daylight. It may be called 



MiCO SERICEUS. (PI. XXIV.) 



Fur pure white, soft and silky ; legs, feet, and tail pale yellowish ; 

 ears large, roundish, flesh-coloured through the distant rigid ex- 

 panding hairs, which form a double fringe on the circumference. 



Three specimens of this species were obtained ; but two are said to 

 have died on the passage, and to have been thrown away : they were 

 all alike in colour and size. 



Description of a New Species of Helix from South Aus- 

 tralia. By George French Angas, C.M.Z.S., F.L.S., 

 F.R.G.S. &c. 



Helix (Rhagada) silveri, n, sp. 



H. perforata, globoso-conica, tenuis, plicis validis obliquis flexuo- 

 sis corrugata, cretacea ; spira conoidea, apice obtuso, sutura 

 distinctn ; anfr. 6, convexiusculis, ultimo antice descendente, 

 peripheria leviter carinato, basi convexo ; apertura obliqua, 

 subovali, marginibus conniventibus, callo tenui junctis, dextro 

 tenui, acuto, expansiiisculo , columellari superne expanso, refiexo, 

 perforationem semitegente. 



Diam. maj. 11, min. 9, alt. 8 lin. 



Hab. The Eastern Plains, South Australia. 



Helix silveri. 



I have named this remarkable and interesting species in honour 

 of Mr. S. W, Silver, to whose kindness I am indebted for specimens 

 of the shell. 



3. Notes on some of the Species of Land Mollusca inhabiting 

 Mauritius and the Seychelles. By Geoffrey Nevill. 



Nanina (Macrochlamys) VIRGINIA, Morel. 



The upper surface of the foot and the tentacles in this species are 

 black, and the sole of the foot is of an iron-grey colour. 



Mauritius. Found on shrubs and on the ground. 

 Proc. Zool. Soc— 1868, No. XVII. 



