350 ACHATIXID.1-. 



Bulimm yOpeas) gmcilis, Pfeiffer, Malalc. Blatt. ii, 1856, p. lo6. _ 

 Steno(/i/ra [Opea's) (jracilis, vou Martens, Die Heliceen, ed. '2, 1860, 



p. ^o ; Nevill, J. A. vS. \^. xlvi, 1877, p. 25 ; ibid., Hand List, i, 



1878, p. 164 ; ibid., Zool. Re,?. Exp. AV. Yunnan, i, 1879, p. 885 ; 



Pfeiffer & Clessin, Nomencl. Helic. Viv. 1881, p. 321. 

 Spiraxis f/mcilis, Blanford, J. A. S. B. xxx, 1861, p. 362. 

 Stenogyr'a (jracilk, von Marteus, Preuss. Exp. Ost-Asien, Zool. 



Theil, ii, 1867, p. 375, pi. 19, tig. 5, pi. 22, tig-. 13 ; Westerlund, 



Vega Exp. Vetensk. Jakt. iv. 1887, p. 187 ; Peile, Jouru. 



Bombay Nat. Hist. Soc. xi, 1908, p. 131. 

 Opeds f/racil/'s, Theobald, J. A. S. B. xlvii, 1878, p. 146 ; Godwin- 



Austeu, P. Z. S. 1895, p. 443 ; Collett, J. A. S. Ceylon, xv, 1898, 



p. 17 ; Smith, Fauna and Geogr. Maldive Sc Laccadive Arch, i, 



part 2, 1902, p. 141. 

 Opeas r/racile, MoUendorrt', P. Z. S. 1894, p. 151 : I'ilsbry, Man. 



Conch, ser. 2, xviii, 1906, p. 125, pi. 18, tigs. 3-6. 

 Bulimm indicus, Pfeitier, P. Z. S. 1846, p. 40; ibid., Mou. Ilelic. 



Viv. ii, 1848, p. 157. 

 Opeas iudicHs, Dautzenberg & Fischer, Journ. Conchyl. liii, 1905, 



p. 102. 

 02}eas apex, Mousson, var. nicobarica, Mlireh, Journ. Conchvl. 1872, 



p. 313. 



Original descrijHioa : — " Shell transparent, thin and pale 

 coloured or rather colourless ; spire gradually tapering ; whorls 

 12, body-whorl equal to the two preceding ones ; length 6i lines*. 

 Aperture longer than broad, semi-ovate ; pillar-lip straight and 

 slightly reflected ; right lip edged." {Hutton.) 



Hah. India: Mirzapore (iTu^on) ; Calcutta, Kajinehal, Chandipal, 

 Patna {NeviU, Maimuaring) ; Erode, Poona, Bombay (Bla7ifon/, 

 Fairhcml-); Bombav Island {Peile); Assam (Stoliczl-a) ; Khasi 

 Hills {Adams); Dafla Hills {God win- Austen); Madras {Blanford); 

 Kashmir {llieohald) ; Naini Tal, Salt Eange, Koorkee {StoUczla). 

 Burma : Zwagabin, Arakan, Rangoon, Moulmain (Stolic:l-a, 

 Theobald) ; Tsagain, Bhamo (Anderson) ; -i\ a, Pegu, Arakan, 

 Moulmain {Blanford). Ceylon : Point de Galle {Martens, Vega 

 Exyed.) ; Ambagamuwa (Collett). Andaman Group (StoUezha, 

 Nevill) ; Port Blair (Godwin- Austen). Nicobar Group : Teressa 

 (Godivin-Aiisten); JN'ancoury (Mdrcli). Laccadive Islands (Stanleg 

 Gardiner). Samui Islands (Mdllendorff). 



In addition to the foregoing localities within the Indian region, 

 the species has been recorded from China, Formosa, and Japan, 

 the Malay Archipelago, the Mascarenes, and Polynesia. The 

 bibliography liere quoted is limited to its bearing on the Indian 

 Fauna, and' I have omitted all references to iti^ occurrence outside 

 the Indian region. Tlie bibliography, including varieties, contained 

 in the Manual of Conchology, comprises upwards of two whole 

 pages. Pilsbrv includes 0. subida, Pfeiffer, under its synonymy, 

 but the identity of the two forms I do not consider has been 

 established, and 1 jirefer to confine the designation of 0. gracile 



* I have only one of this length, the generality being about 5 lines. It has 

 also 12 whorls, vrhile the others have about 9 or 10. 



