348 ACHATISID.E. 



308. Eacillum orthoceras, Goclwia-Austeu. 



Glessula orthoceras, Godwin-Austeu, J. A. S. B. xliv, 1875, p. 2, 



pi. 1, fig. 4 ; op. cit. xlv, 1876, p. 310. 

 Achatina orthoceras, Hanley & Theobald, Conch. Ind. 1876, pi. 159, 



Steno(/yra (Glessulti) orthoceras, Nevill, Hand List, i, 1878, p. 172. 

 Stenoqyra (Subulina) orthoceras, Pfeiffei" & Clessin, Xomencl. Ilelic. 



Viv! 1881, p. 327. 

 Bacillnm orthoceras, Pilsbrv, Man. Conch, ser. 2, xviii, 1906, p. 2, 



pi. 1, tigs. 2, 3, 12. 



Original description. — " Shell very slender and elongate, pale 

 grey or white, very finely and regularly ribbed throiigliout, very 

 solid, apex blunt ; whorls 13-14, slightly rounded, suture well 

 impressed ; aperture oblique, rounded below, outer lip sliarply 

 edged and continued as a well developed callus upon the strong 

 thickened coluinellar margin. 



"Length 2-32 [59 mm.], major diam. 0*4 inch [10 mm.].'' 

 {^Godwin- Austen.) 



Hah. India: AV. Khasi Hills; Nongumlai ; Laudomodo (God- 

 win-Austen) ; Harmutti, Datla Hills {Godivin- Austen). 



" The species can at once be distinguished fi'om G. casiaea, 

 Bens., by its white colour and by the absence of the dark brown 

 epidermis that covers the latter; the whorls also are much n)ore 

 rounded, whereas in casiaea they are neai'ly flat.'' (Godivin- 

 Austen.) 



In addition to the differentiating characters noted by Godwin- 

 Austen, orthoceras has a narrower base and the costse are finer and 

 more crowded, 



Var. austeni, Pilshrt/. 



Bacillnm orthoceras auste7ii (subsp.), Pilsbry, Man. Conch, ser. 2, 

 xviii, 1906, p. 3, pi. 1, tig. 4, 



Original description : — " Shell with the gi'ey color, deficient 

 cuticle and convex wiiorls of B. orthoceras, but lunch more rapidly 

 tapering, the last whorl being much wider ; striation coarser. 

 Spire straightly tapering, very slender above. The early whorls 

 are broken from the type specimen, 9| remaining. Length 

 (broken) 53*8, diam. 12, length ot aperture 12-5 mm,"' (Pilsbri/.) 



Hah. India : Naga Hills, 



Genus CURVELLA, Chaper. 



Ilapcdus, Albers, Die ileliceen, 1850, p, 140 (section of BidimuSy 

 only species B, grateloupi, Pfeifi'er) ; von 31artens, Die Ileliceen, 

 ed. 2, 1800, p. 238: non Hapalus, Billberg, 1820 (Coleopteni). 



Curvella, Chaper, Bull. Soc. Zool. France, x, 1885, p. 49; Pilsbry, 

 Man. Conch, ser. 2, xviii, 1906, p. 46. 



Type, 0. sulcata, Chaper. 



Range. India, China, Philippine Islands, West, East, and South 

 Africa. 



