HELICID^. . 877 



There are specimens in the Indian Museum from Prome, Akoixtong, Assam, and 

 Khasi Hills ; it was also found by Dr. Anderson at Manwyne and in the Shan hills. 

 Specimen from Akoutong : axis 6, diam. 15 1 mm. 



var. BHAMOENSis, Nevill. 

 Helix [Plectotropis) tapeina, var. Ihaiiweims, Nevill, /. c, p. 18. 



Distinguished from typical R. tapeina by the last whorl, which is only slightly 

 angular and not distinctly keeled ; the aperture is smaller and less produced, with 

 the columellar margin slightly ohhque and angular at base ; it is smoother and less 

 depressed than var. rotatoria, with squarer aperture and without the acute keel at 

 the periphery. The raised spire and angulate (not keeled) periphery agree with 

 those of S. phayrei ; it is, however, smoother, less openly umbiUcated, with more 

 contracted aperture and less developed sciilpture than that species. 



This variety connects H. tapeina almost insensibly mth S. catostoma, Blf., 

 and its varieties ; the more raised spire, less open umbilicus, and more rounded and 

 regular margins of the aperture, without any sign of being thickened or subden- 

 tiform at then' base, are the best distinguishing characteristics. 



Eour typical specimens of this variety were found at Bliam6. Major Godwin- 

 Austen has also obtained some similar specimens from the Naga hills. Plate xv, 

 fig. 10, of the Con. Indica looks to me as much like this variety as it does the shell 

 it is said to represent (that is, M. arakanensis, Theob.,^ from which, however, it is 

 easily distinguished by its more open umbilicus, less conically raised spire, and by 

 the absence of the acute keel at the periphery, &c. 



Type from Bham6 : axis 6 J, diam. 12^ mm. 



Helix (Plectotropis) teichotropis, Pfr. 



Helix tricJwtropis, P£r., Zeits. fur Malak, 1850, p. 73; Couch.-Cab., pi. 134, figs. 9, 10. 

 Helix (Plectotrojjis) tricJiotrojns, Nevill, I. c, p. 19. 



This species differs from S. tapeina by the shape being a trifle more trochoid, 

 the apex more central, and the whorls more concave ; the keel at the periphery is 

 even more developed and the aperture a trifle more produced laterally ; a marked 

 characteristic is the minute and close spiral sculpture of the base, which in 

 S. tapeina and all its varieties is, on the other hand, distinctly, though minutely, 

 granulose ; it is principally on account of this last character that I prefer to class 

 K. trichotropis as a distinct species, and not as a variety of H. tapeina (near rotatoria 

 and akoutong ensis). 



Major Godwin- Austen found an extremely interesting form in the Khasi Hills, 

 with more depressed spire and thinner textm-e (axis 6, diam. 18 mm.) ; it is, I believe, 



' Joui-n. As. Soc, Bengal, 1864, p. 5. 



