BY JAMES C. COX, M.D., F.S.L. 115 



distinguished from that species by its white diaphanous aspect, 

 light pink peristome, and by the absence of the characteristic 

 oblique fine strire on the surface of the whorls. 



2. — Helix (GeotrocJms) Chapmant, Fig. 2. 



Shell imperforate, trochiform, very finely transversely striated 

 from above downwards, and longitudinally striated with fine 

 waved lines, white, diaphanous, shining ; spire conical, whorls 

 six, gradually increasing in size, apex acute, suture impressed, 

 last whorl reflected, angulate at the periphery ; base flattened ; 

 aperture oblique, irregularly ovately-lunate, margins approached 

 joined by a dark reddish-black callus ; peristome expanded and 

 reflexed, margined externally with two narrow bands, the one 

 next the lip orange-red, the other above but close to the last, 

 dark black ; these two coloured bands show through, the shell 

 and margin the internal edge of the peristome the same as they 

 do the external edge ; columella'adnate, broad and expanded, 

 coloured by the blending of the two coloured bands of a black 

 and orange-red ; interior of the aperture beyond the bands white. 



Diameter, greatest 1*14 ; least 1*00; height T30 of an inch. 



Habitat, Eossell Island, one of the Louisiacle Group of Islands, 

 Torres' Straits. 



This lovely species is also in Mr. Hargrave's collection, recently 

 purchased and presented to the Australian Museum by Mr. 

 Thomas Walker, of Concord. The only shell having any 

 pretention to the beauty of this fine species is Helix xanthocheila, 

 Pfr. It is a more solid and opaque shell than xanthocheila, 

 more broadly conoid, and the lip is less expanded. I have named 

 it in honour of my friend Captain W. C. Chapman, E.N., late in 

 command of H. M. Ship Dido, who laboured hard during his 

 cruises through the Pacific Islands to develope their beautiful 

 fauna. 



