HELICIDiB. 879 



characters of the lip developed. M. catostoma was found tolerably abundantly in 

 the Naga Hills, by Major Godwin- Austen and Mr. Robert, and it is probably one of 

 their specimens that is figured in the Con. Indica. They only differ from the type 

 by the less depressed spire and slightly less open umbilicus ; the characters of the 

 apertui-e are the same, the dentiform process on the basal margin being equally 

 developed and characteristic in both. 



Helix (Plectotropis) huttoni, Pfr., var. savadiensis, NeviU. 



Helix hittoni, Pfr., Symb. II, pt. 3. 



Helix (Plectotropis) huttoni, var. savadiensis , Nevill, I. c, p. 20. 



The shell represented in Con. Indica, pi. xv, fig. 8, is not, I think, a typical 

 specimen from the North- West Himalayas, but rather a specimen from DarjeeHng ; 

 the former is a smaller, more rounded, and less solid shell, scarcely keeled at the 

 periphery, with a higher spire and less produced aperture. A form found by 

 Dr. Anderson abundantly at Ava and Ponsee is nearer the Darjeeling form ; the 

 spire is slightly higher, with the apex more central. Seven specimens of a distinct 

 and remarkable variety were also found at Sawady ; at first sight these present a 

 curious resemblance to H. arakanensis, and with that species are probably the con. 

 necting link between H. tapeina and S. Imttoni, though unmistakably only a variety 

 of the latter ; var. savadiensis differs by its m.ore raised spire, stouter texture, and 

 less open umbilicus. S. lointeriana, v. d. Busch. (Java), seems to be a var. of S. 

 huttoni, differing by its more open umbilicus. 



Specimen from Darjeehng : axis 5J, diam. 12|- mm. 



Var. savadiensis, from Sawady : axis 7, diam. 12| mm. 



Helix (Plectotropis) phatbei, Theob. 



Helix pJiayrei, Theob., Journ. As. Soc, Bengjal, 1859 ; Con. Indica, pi. i, fig. 15. 

 Helix (Plectotropis) nhayrei, Nevill, I. c, p. 20. 



This is the largest species of the group, and is well figured in the Con. Indica ; 

 it appears to be rare. It is next allied to typical R. tapeina, the umbilicus being 

 exactly similar ; the periphery, however, is merely angulate, not keeled ; the sculp- 

 ture above is considerably coarser and more developed, the columellar margin more 

 oblique and slightly angulate at base, and the outer margin more produced and 

 rounded. 



Sub-Genus Trachia, Beck. 

 Helix (Trachia) delibrata, Bens. 



Helix delibrata, Bens., Journ. As. Soc, Bengal, vol. v, 1836, p. 352. 

 Helix p-ocmnhens, Gld., Proc. Bost. Soc, vol. iv, 184.-i, pi. 53, t. 2i, fig. 1. 

 Helix (Trachia) delibrata, Nevill, I. c., p. 21. 



