PLECTOTBOPIS. ^GISTA. 217 



Eulota (Plectotropii) perplanata, Pilsbry, Man. Conch, ser. 2, ix, 

 1895, p. 209. 



When first publishing the name, Nevill was undecided whether 

 it was a distinct form, a variety of H. trichotropis, or of H. tapeina 

 (near var. rotatoria). I have already stated my reasons for con- 

 sidering that neither P. trichotropis nor P. rotatoria occur within 

 the limits of the Indian region, and I regard H. perplanata simply 

 as a form closely allied to the variety akowtongensis, from which it 

 may be separated by the larger diameter and the more depressed 

 spire. 



Var. bhamoensis, Nevill. 



Helix (Plectotropis) tapeina,VAr. bhamoensis, Nevill, J. A. S. B. xlvi, 

 1877, p. 18 ; ibid., in Anderson, Zool. Res. Two Exped. West. 

 Yunnan, 1878, p. 877. 



*' Distinguished from typical H. tapeina by the last whorl, which 

 is only slightly angular and not distinctly keeled ; the aperture is 

 smaller and less produced, while the columellar margin is slightly 

 oblique and angular at the base. It is smoother and less depressed 

 than the 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 H. phayrei ; it is, however, 

 smoother, less openly umbilicated, with more contracted aperture 

 and less developed sculpture than that species. This variety 

 connects H. tapeina almost insensibly with H. catostoma and its 

 varieties. Plate 15, fig. 10 of Conch. Ind. is much more like it 

 than H. arakanensis" {Nevill.) 



Diam. 12*5, axis 6'5 mm. 



Hob. Burma: Bhaino (Anderson). India: Naga Hills (Godwin- 

 Austen). 



I have not seen any specimen answering to NevilFs definition 

 of this variety, and it is somewhat difficult to understand what he 

 means when he states that it differs from tapeina " by the last 

 whorl, which is slightly angular and not distinctly keeled," winding 

 up with the statement that " plate 15, fig. 10, of Conch. Ind. is 

 much more like it than H. arakanensis" seeing that the figure 

 referred to is distinctly keeled. 



Genus JEGISTA, von Martens. 



JEffista (Albers), von Martens, Die Heliceen, ed. 2, 1860, p. 121. 

 jEgista, Pilsbry, Man. Conch, ser. 2, ix, 1895, p. 210, as section of 

 Eulota, pi. 65, fig. 10 (jaw), fig. 9 (radula). 



TYPE, Helix oculus, Pfeiffer. 



Range. India, Burma, Farther India, Japan, China and 

 adjacent islands, south to the Malay Archipelago. 



" Shell depressed and broadly umbilicated, solid, striated ; 

 brown, unicolored or with a light peripheral band ; spire low, 

 composed of many narrow whorls, the last not keeled, descending 



