564 DR. J. COX ON NEW LAND AND MARINE SHELLS. [Julie 1 7, 



2. Descriptions of new Species of Land and Marine Shells 

 from Australia and the Solomon and Louisiade Islands. 

 By J. Cox, M.D., C.M.Z.S. 



[Heceived May 16, 1873.] 

 (Plate XLVIII.) 

 Helix allasteri, sp. nov. 



Shell with a deep narrow concealed umbilicus, semiglobose, smooth, 

 transversely very finely striated with lines of growth ; the whorls of 

 the apex also longitudinally finely striated, translucent, pale straw- 

 coloured, ornamented above and below with numerous rather narrow- 

 opaque white and clear bands ; whorls 5, rapidly increasing in size, 

 the last much inflated and obtusely carinated, not depressed in front, 

 convex above and below ; aperture ovately rounded, subaugulated at 

 the periphery, showing the opaque and clear zones within ; peristome 

 smooth and shining ; lip very broadly expanded and reflexed ; mar- 

 gins approximate, upper attached to the carina of the body-whorl, 

 columellar broadly dilated, overhanging and concealing the umbilicus. 



Diam., greatest 0-98, least 064 ; height 060 of an inch. 



Hab. Solomon Islands (?>ius. Co.v). 



This beautiful species may be at once distinguished by the very 

 peculiar alternate opaque white and clear zones. Amongst a large 

 number of specimens procured I have not found one to vary in this 

 respect. 



(The specimen sent was so broken in transit that it could not be 

 figured. — Ed.) 



Helix (CamjEna) arthuriana, sp. nov. (Plate XLVIII. figs. 

 1, la.) 



Shell globosely depressed, largely and openly umbilicated, very 

 dark chestnut, almost black, lighter at the apex, transversely finely 

 striated ; whorls 6, very gradually increasing in size, last sharply 

 depressed in front ; suture conspicuously margined below with white ; 

 spire bluntly convex ; base somewhat flattened ; aperture ovately 

 lunate, livid within, margins closely approximate, joined by a thin 

 callus ; peristome straight, expanded and reflexed, of an intensely 

 dark livid purple colcur ; columellar margin triangularly dilated, 

 overhanging the umbilicus. 



Diam., greatest I "28, least - 90 ; height 0"77 of an inch (mus. 

 Hargraves). 



Hub. L Island, Torres Straits, North Australia. 



More closely allied to H. o'connellensis, Cox, than to any other 

 species. It is more globose, and it has not the excavated base 

 round the umbilicus so characteristic of that species ; the aperture is 

 also much more round, with the margins more approximated. 



Helix (Cam^ena) rawnesleyi, sp.nov. (Plate XLVIII. fig. 2.) 

 Shell broadly coniform, openly umbilicated, obliquely finely striated 



