356 AC'HATINID^. 



Bulimu* (Opeas} gracilis, Pfeiffer, Malak. Blatt. ii, 1856, p. 156. 



Stenogyra (Opeas) yraeilis, von Martens, Die Heliceen, ed. 2, I860, 

 p. 265 ; Nevill, J. A. S. B. xlvi, 1877, p. 25 ; ibid., Hand List, i, 

 1878, p. 164 ; ibid., Zool. lies. Exp. W. Yunnan, i, 1879, p. 885 ; 

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



Spiraxis gracilis, Blanford, J. A. S. B. xxx, 1861, p. 362. 



Stenogyra gracilis, von Martens, Preuss. Exp. Ost-Asien, Zool. 

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

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

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



Opeas gracilis, Theobald, J. A. S. B. xlvii, 1878, p. 146 ; Godwin- 

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

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

 part 2, 1902, p. 141. 



Opeas gracile, Mollendorff, P. Z. S. 1894, p. 151 ; Pilsbry, Man. 

 Conc'h. ser. 2, xviii, 1906, p. 125, pi. 18, tigs. 3-6. 



Bulimus indicus, Pfeiffer, P. Z. S. 1846, p. 40 ; ibid., Mon. Helic. 

 Viv. ii, 1848, p. 157. 



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

 p. 102. 



Opeas apex, Mousson, var. nicobarica, Morch, Journ. Conchvl. 1872, 

 p. 313. 



Original description : " Sliell transparent, thin and pale 

 coloured or rather colourless ; spire gradually tapering ; whorls 

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

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

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



Hob. India: Mirzapore (Hutton) ; Calcutta, Kajmehal, Chandipal, 

 Patua (Nevill, Mainwaring) ; Erode, Poona, Bombay (Blanford, 

 FairbanTc)', Bombay Island (Peile); Assam (Stoliczlca) ; Khasi 

 Hills (Adams); Dana Hills (God win- Austen)-, Madras (Blanford) ; 

 Kashmir (Theobald); Nairn Tal, Salt Eange, lloorkee (Stoliczka). 

 Burma : Zwagabin, Arakan, Rangoon, Moulmain (Stoliczlca, 

 Theobald) ; Tsagain, Bliaiuo (Anderson) ; Ava, Pegu, Arakan, 

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

 Exped.) ; Ambagamuwa (Collett). Andaman Group (Stoliczka, 

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

 (Godwin- Austen) ; Nancoury (Morch). Laccadive Islands (Stanley 

 Gardiner). Samui Islands (Mollendorff). 



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 here quoted is limited to its bearing on the Indian 

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

 the Indian region. The bibliography, including varieties, contained 

 in the Manual of Conchology, comprises upwards of two whole 

 pages. Pilsbry includes 0. subula, Pfeiffer, under its synonymy, 

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

 established, and 1 prefer 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, while the others have about 9 or 10. 



