348 ACHATINIDJE. 



308. Bacillum orthoceras, Godwin- Austen. 



Glessula orthoceras, Godwin-Austen, 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,. 



fig. 6. 



Stenogyra (Glessula) orthoceras, Nevill, Hand List, i, 1878, p. 172. 

 Stenogyra (Subulina) orthoceras. Pfeiffer & Clessin, Nomencl. Helic. 



ViV. 1881, p. 327. 

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



pi. 1, figs. 2, 3, 12. 



Original description. " Shell very slender and elongate, pale 

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

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

 impressed; aperture oblique, rounded below, outer lip sharply 

 edged and continued as a well developed callus upon the strong 

 thickened columellar margin. 



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

 ( God win- Austen.) 



Hob. India : W. Khasi Hills ; J^songumlai ; Laudomodo (God- 

 win-Austen) ; Harmutti, Dana Hills ( Godwin- Austen}. 



" The species can at once be distinguished from G. casiaca^ 

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

 epidermis that covers the latter; the whorls also are much more- 

 rounded, whereas in casiaca they are nearly flat." (Godwin- 

 Austen.) 



In addition to the differentiating characters noted by Godwin- 

 Austen, orthoceras has a narrower base and the costa3 are finer and 

 more crowded. 



Yar. austeni, Pilsbry. 



Bacillum orthoceras austeni (subsp.), Pilsbry, Man. Conoh. ser. 2,, 

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



Original description : " Shell with the grey color, deficient 

 cuticle and convex whorls of B. orthoceras, but much more rapidly- 

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

 Spire straiglitly tapering, very slender above. The early whorls 

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

 (broken) 53'8, diam. 12, length of aperture 12-5 mm." (Pilsbry.), 



Hab. India : Naga Hills. 



Genus CURVELLA, Chaper. 



Hapalus, Albers, Die Heliceen, 1850, p. 140 (section of Bulimus,. 

 only species B. qrateloupi, Pfeifl'er) ; von Martens, Die Heliceen, 

 ed. 2, 1860, p. 238; non Hapalus, Billberg, 1820 (Coleoptera). 



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

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



TYPE, 0. sulcata, Chaper. 



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

 Africa. 



