CHILONOPSIS. 181 



Length 20, diam. 8, aperture 9 mm. 



St. Helena: Sugarloaf Ridge, common (Turton). Extinct. 



Achatina exulata Benson ]\IS., REEVE, Conch. Icon, v, text 

 of plate xxi, no. 77 (March, 1850) ; Bulinws, pi. 78, f. 572. 

 Bulimus exulatus WOLL., Testae. Atlant. p. 542. Buli- 

 mulus exulatus SMITH, P. Z. S. 1892, p. 266, pi. 22, f. 16.- 



B. (Cleostyla) exulatus Bens., DALL, Proc. A. N. S. Phila. 

 1896, p. 419. 



A somewhat cylindric shell, with conic, slightly nipple-like 

 summit, and strongly truncate columella. 



6. C. TURTONI (E. A. Smith). PI. 52, figs. 59, 60. 



Shell narrowly perforate, ovate-conic, very thin, glossy; 

 brownish-corneous, painted longitudinally with irregular 

 opaque-white streaks. Whorls 7, a, little convex, striated with 

 oblique growth-lines, the last whorl rounded at the periphery 

 (obsoletely angular in young shells), the apex subpapillar. 

 Aperture ovate, acuminate above, hardly half the total length 

 of the shell; peristome very thin, the outer margin simple, 

 scarcely expanded, columellar margin narrowly reflexed above 

 the umbilicus, delicately calloused, provided with a small fold 

 or denticle in the middle. Length 17, diam. 7.75 mm., aper- 

 ture 7.75 mm. long, 4 wide (Smith). 



St. Helena: High Peak, among native vegetation (Turton). 



Bulimulus turtoni SMITH, P. Z. S. 1892, p. 266, pi. 22, f. 

 17, 17o. 



The thin texture, shape and coloration of this snail remind 

 one of the arboreal Dryma-us, some species of which are not 

 dissimilar. The axis is rather large and hollow. The colu- 

 mella, in adults, bears a short, oblique callous superposed 

 upon the cylinder near its base (pi. 52, fig. 60), much as in 



C. exulatus. Mr. Smith writes as follows : 



"The substance of the shell is extremely thin and fragile 

 and the surface exhibits no other sculpture excepting lines 

 of growth. The color ornamentation is variable. In what 

 may be regarded as the typical form the opaque creamy lon- 

 gitudinal markings take the form of broadish irregular wavy 

 stripes, which frequently run into one another, so that they 



