OPEAS GRACILE. 127 



Bulimus indicus PFR., P. Z. S. 1846, p. 40; Monogr. ii, p. 

 135 (East Indies). -- Opeas indicus Pfr., DAUTZENBERG, 

 Journ. de Conch, liii, Dec. 1905, p. 102 (Tonkin). Bulimus 

 cereus REEVE, Conch. Icon, v, Bulimus no. 501, pi. 17 

 Achatina, f. 81, July, 1849. (Moradabad, India). Bulimus 

 apex MOUSSON, Land und Siisswasser Moll. Java p. 35, pi. 4, 

 f. 5 (Java). 



Bulimus subula CROSSE & FISCHER, Journ. de Conch. 1863, 

 p. 361, pi. 14, f. 6 (Saigon, and Fuyen-Moth, Cochin China). 



-" Opeas subulata Pfr.," Hungerford in coll., teste Garrett 

 (Hong-Kong). Opeas subula Pfr., MLLDFF., Annuaire Mus. 

 Zool. Acad. Imp. Sci. St. Petersburg, VI, 1901, p. 390 (Tapa 

 on the Tung river; between Shuang-liu and Hsin-dshing, 

 Sytshuan, China). SMITH, monograph of Christmas Island 

 p. 57, 1900 (Christmas I., Ind. 0.). 



? Bulimus decorticatus REEVE, Conch. Icon, v, pi. 80, f. 

 592 (Macao, China) ; Cf. p. 34. 



Helix clavulus QUOY et GAIMARD, Voy. de 1 'Astrolabe, Zool. 

 ii, p. 133, pi. 11, f. 30-33 (He de France). 



M. Dautzenberg states that Hutton described this species 

 without specific name in 1834; but Hutton on p. 93 of his 

 paper gives a table of the names, expressly indicating those 

 he had named. 



This species, including 0. subula which I agree with Boett- 

 ger is not separable from gracile, has a wide range in the 

 tropics of both hemispheres. In the Old World it is especi- 

 ally characteristic of the Oriental Region of Wallace, but 

 passes beyond into Polynesia, and in the northeast reaches 

 to Japan, which has an Oriental land-snail fauna. West- 

 ward it reaches Aden, probably Abyssinia, British East 

 Africa and the Mascarene Is. 



It is perforate, slender, ' and regularly, straightly taper- 

 ing to the small, obtuse apex, pale-yellowish corneous, with- 

 out much gloss. The moderately and regularly convex 

 whorls are very distinctly, arcuately striate. The suture is 

 usually a trifle irregular, and often quite distinctly crenu- 

 late, and the surface below it is more or less distinctly puck- 

 ered. The aperture is long, rhombic-ovate, and the columel- 



