180 CHILONOPSIS. 



white spots, corresponding to those upon the bosses in 

 C. melanioides and subplicatus. 



4. C. SUBTRUNCATUS (E. A. Smith). PI. 52, fig. 54. 



Shell subfossil, long ovate, acuminate above, imperforate, 

 striated with delicate, oblique growth-lines. Whorls 7, a 

 little convex, separated by a somewhat deep suture, the last 

 whorl obliquely sloping, but slightly ascending to the lip. 

 Aperture inversely ear-shaped, hardly half the length of the 

 shell ; lip thin, slightly spreading or expanded in front. 

 Columella oblique, rather straight, connecting with the outer 

 lip by a thin callous above ; anteriorly more or less subtrun- 

 cate. Length 31.5, diam. 12.5 mm., aperture 14 mm. long, 

 7 wide (Smith). 



Length 28, diam. 11.5 mm., length of aperture 13 mm. 



St. Helena: Side Path, common (Turton). Extinct. 



Bulimulus subtruncatus E. A. SMITH, Proc. Zool. Soc. 

 London 1892, p. 266, pi. 22, f. 14. B. (Cleostyla) subtrun- 

 catus Sm., BALL, Proc. A. N. S. Phila., 1896, p. 419. 



This species is larger than C. exulatus, more fusiform, with 

 the columella far less distinctly truncate. It apparently had 

 the same type of coloring, oblique, often intersecting opaque- 

 white markings, for some specimens are corroded in that 

 pattern. 



5. C. EXULATUS ('Benson' Rve.). PI. 52, figs. 57, 58. 



Shell oblong, imperforate, rather thin, gray-white, pro- 

 fusely marked with a tracery of opaque white. Spire sub- 

 cylindric, terminating in a rather slender cone. Whorls 6!/2> 

 the first 4 convex and slowly widening, the rest very rapidly 

 widening and less convex ; suture simple, impressed. Sculp- 

 ture of fine wrinkles along growth-lines, a little stronger on 

 the intermediate whorls, where they are more or less dis- 

 tinctly cut by spirals. The aperture is acutely ovate, subver- 

 tical. The outer lip though thin is obtuse at the edge ; outer 

 and basal margins noticeably flaring. Columella short, 

 prominent and truncate at the base, and bearing a low, very 

 deeply placed fold above. 



