78 BRACHYPODELLA, S. STR. 



other related forms of the Lesser Antilles. Mr. Gibbons found 

 a specimen with two apertures, which he correctly explains 

 by the accidental breakage of a hole in the shell, which is used 

 instead of the natural aperture ; an incident observed in other 

 Urocoptida and Clausttiida. Mr. Marshall's explanation 

 puts the cart before the horse. 



29. B. COSTATA (Guilding). PL 7, figs. 35, 36, 37. 



Shell rimate, cylindric below, the upper half tapering to a 

 narrow truncation, or more rarely entire and attenuate above ; 

 brown. Surface rather dull, sculptured with oblique, nearly 

 straight, low riblets, separated by wider intervals. Whorls 

 narrow, convex, the last not free in front or but slightly so, 

 strongly carinate below, concave above the keel. Aperture 

 rounded, angular below and obtusely so outwardly; peris- 

 tome reflexed above and along the columellar margin, else- 

 where expanded, very narrow at the outer angle, continuous, 

 but usually adnate above. Axis slender and simple. 



Length 10.3, diam. 2.6 mm., whorls 11. Truncate. 



Length 7, diam. 2.5 mm., whorls 8. Truncate. 



Length 11, diam. 2.4 mm., whorls 16. Entire. 



Length 9.6, diam. 2.7 mm., whorls 14. Entire. 



Barbados (Guilding, Swift and others), very abundant 

 under stones, particularly in the lowlands (Fielden). St 

 Vincent (British Mus., teste Smith). 



Br achy pus costatus GLDG., Zoological Journal, iv, p. 167 

 (1828). Siphonostoma costata Guild., SWAINSON, Malacol- 

 ogy, p. 168, f. 22 (not p. 333, f. 97c,d) . Cylindrella costata 

 Guild., PFR. in Philippi, Abbild., i, p. 183, pi. 1, f. 16 (after 

 Swainson) ; ii, p. 52, pi. 2, f. 8; Conchyl. Cab., p. 44, pi. 5, 

 f. 4-6; Monogr., ii, p. 379; iv, 705; vi, 381. FISCHER & 

 CROSSE, J. de C., 1870, pp. 11, 25, pi. 4, f. 2 (teeth). Sow- 

 ERBY, C. Icon., xx, pi. 12, f. 109. E. A. SMITH, Ann. Mag. 

 (6), viii, 1891, p. 255. 



The specimens figured are from Barbados, where it occurs 

 in abundance. I have not seen the species from other islands. 

 The collector of the alleged St. Vincent specimens in the 

 B. M. is apparently unknown. Guilding does not record it 



