OPEAS, CEYLON AND TONKIN. 159 



Old shells (fig. 83) become opaque; the upper whorls are 

 eroded, and the cuticle is liable to fungoid attack which 

 erodes it in dots, often at the suture. When fully adult the 

 shell is imperforate and measures, length 11, diam. 4, length 

 of aperture 4 mm., whorls 7%. Specimens of 8% nun. length, 

 rimate and with obviously immature peristome, often contain 

 numerous eggs. The figures on pi. 4 are from the Concho- 

 logica Indica. On plate 16, figs. 82, 83, one of the specimens 

 received from Nevill is drawn. 



37. 0. MARINE Jousseaume. PI. 19, fig. 21. 



Shell subperforate, long-turrited, rather solid, opaque, ar- 

 cuately striate, white, with a yellowish-white cuticle, slightly 

 glossy. Spire long, the apex obtuse, suture immersed, crenu- 

 late. Whorls 8, a little convex, the last four-ninths the total 

 length. Aperture oblong-oval, obliquely truncate above ; 

 peristome simple, acute, the right margin depressed above, 

 nearly straight, columellar margin widely dilated and re- 

 flexed, partly bounding the perforation. Length 9, diam. 

 2 mm. (Jouss.). 



Ceylon: Kandy (E. Simon), one specimen. 



Opeas maricz Jouss., Mem. Soc. Zool. France vii, 1890, p. 

 290, pi. 4, f. 9. 



Unknown to me. Sykes suggests that it may be 0. gracile. 



38. 0. CARINATUM ( Wattebled) . PI. 19, fig. 19. 



Shell imperforate, very minute, conic-elongate, the apex 

 acute; subpellucid, pale tawny. Whorls 6, a little convex, 

 gradually increasing. Suture well marked, bordered above 

 by -a fine carina which is stronger on the middle of the last 

 whorl where it becomes visible to the naked eye. Aperture 

 subquadrate; peristome simple, unexpanded and acute, the 

 columellar margin arcuate, outer margin angular. Length 

 3, diam. 0.75 mm. (WatteUed). 



Cochin-China: Long-Xuyen. (Capt. Dorr). 



Stenogyra carinata WATTEBL., Journ. de Conch. 1884, p. 

 125, pi. 6, f. 1. 



A very small form differing from all other Opeas known by 



