565 



DESCRIPTIONS OF SOME NEW SPECIES OF PULMO- 



NATE MOLLUSCA FROM AUSTRALIA AND 



THE SOLOMON ISLANDS. 



By J. C. Cox, M.D., F.L.S. 



(Plates xx. and xxi.) 



Helix (Hadra) oscarensis, n.sp. 



(PL xx., figs. 6 and 7, enlarged twice). 



Shell lenticular; of a dull lustrous opaque cretaceous pale cream 

 colour, except the three apical whorls, which are of a dark yellowish- 

 brown hue, and this deepening of colour in a less degree is mani- 

 fested in a few irregular-sized spaces across the whorls (not 

 sufficiently shown in fig. 6). Whorls six ; very gradually increas- 

 ing in size ; irregularly, but closely, rather coarsely, transversely, 

 arcuately striate, with lines of growth becoming less distinct on 

 the three apical whorls as they approach the apex ; the whorls 

 are flatly slanting, not so rounded as fig. 6 would lead to suppose, 

 smoother below the periphery of the last whorl than above ; last 

 whorl sub-acutely keeled at the periphery, the keel is white and 

 opaque, margining the periphery of the last whorl before reaching 

 the peristome, causing it to be rather acutely angled ; immediately 

 below the peripheral carinal edge of the last whorl, the colour of 

 the shell is darker than the rest of the lower half of the whorl. 

 With the mouth away from one, as shown in fig. 7, the shell is seen 

 to have a deep open umbilicus, more so than is represented in 

 fig. 7, about one-third of it being overlapped by an expanded 

 columella ; the peristome is simple, everted and slightly expanded; 

 aperture roundly lunate, darker within than at the internal edge; 



