CURTELLA. 349 



" Coqnille regulierement conique, mince, iioii ombiliquee, recou- 

 verte d'lin epidenue trcs mince, luisanr, olivatre ; de cinq a six 

 tours de spire, pen globuleux. ornes de stries ou cotes d'accroisse- 

 ment, columelle droite ou courbe ; ouverture a, bords trancliants : 

 bord columellaire legerement etale en arriere ; bord externe forte- 

 raent arque en avant dans sa partie moyenne, se recourbant 

 brusquement en sens contraire vers sa base de facon que la suture 

 €n soit fortement reportee en arriere." (Chaper.) 



" This genus is separated from Opeas by tbe forwardly arched 

 outer lip, the shorter, wider contour, and usually smaller number 

 of wliorl^. The columella is frequently sinuous. In some cases 

 the separation from Opeas seems somowhat arbitrary, and the 

 boundaries of the two groups in detail are still unsettled. Tlie 

 species were considered Bulimi in the older classifications, but 

 there is no doubt that they are Achatinoid. 



" Central tooth of the radula narrow, laterals tricuspid. Eepro- 

 duction is by globular eggs, small and calcareous-shelled, as in the 

 ■closely related group Opeas." (Pilsbri/.) 



309. Curvella sikkimensis, lieeve. 



Bulimus sikkhnensis. Reeve, Conch. Icon, v, 1850, Btilimus, pi. 87, 



fio-. 651 (jnv.); Pfeift'er, Men. Helic. Viv. iii, 1853, p. 436; 



ibid., Conch. -Cab., Bulimus, 1853, p. 78, pi. 21, figs. 10, 11 : 



Benson, A. M. N. H. ser. 3, v, 1860, p. 464; Hanlev & Theobald. 



Conch. Ind. 1870, pi. 19, tig. 7. 

 Bulhina (liJuic/iis) sikkimensis, PfeifFer, Malak. Bliitt. ii, 1850, 



p. 161. 

 Ilupahcs sikkimeufis, Nevill, Hand List, i, 1878, p. 174. 

 Ste?io(/i/ra {Spira.vis (Nofhus)) sikkijiiensis, Pfeifler tS: Clessin. 



Noniencl. Helic. Viv. 1881, p. 324. 

 Curvella sikkimensis, Pilsbrv, Man. Conch, ser. 2, xviii, 1906, p. 66. 



pi. 9, figs. 59, 00. 



Oriffinal description : — " Shell ovate, somewhat inflated, spire 

 rather short, obtuse at the apex, whorls four in number, the last 

 much the largest, concentrically finely striated, sutures im- 

 pressed, columella slightly twisted, thinly reflected, aperture 

 oblong, slightly sinuated at the upper part, pale olive, semi- 

 transparent.'" (Beeve.) 



Hah. India : Darjeeling, Sikkini {Benson, Blanford, StoUczlca, 

 Mainwarimj). 



" The sliell figured in ' Conchologia Iconica ' as Bulimus sikkim- 

 ensis, Keeve, proves to be an extremely young specimen of a fine 

 Spiraxis, of which an example with seven whorls, was obtained at 

 Darjeeling by Mr. W. T. Blanford, measuring 27 mill, in lengtli 

 by nearly 10 in diameter.'* (Benson.) 



Four specimens in the British Museum measure only 17 mm. 

 in length, with a diameter of G-5 mm., but these are "probably 

 immature. 



