96 COCilLlTOMA. 



greenish-yellow or olive, streaked here and there longitudin- 

 ally with a darker tint. Whorls about seven in number, the 

 upper ones moderately convex, and sculptured with some- 

 what coarse granulation, which is formed by the strongly 

 marked oblique lines of growth being intersected by less pro- 

 nounced spiral striae; this granulose sculpture becomes al- 

 most obsolete on the upper half of the last volution and 

 vanishes entirely below the middle. The aperture is large 

 and occupies more than half the entire length of the shell; 

 it is oval in form, acuminated above, and coated within 

 with a bluish- white callous deposit; columella nearly perpen- 

 dicular, curved very slightly in an outward direction and 

 tinted with a very pale shade of livid pink. It is abruptly 

 truncated below and invested with a thin callosity, which 

 extends over the oral side of the whorl and joins the thin 

 peritreme above. (Smith). 



Length 80, diam. 39; aperture 45x26 mm. (Smith). 



S. Africa : Eastern slope of the Drakensberg mountains, 

 at Leydenburg Gold Fields, Transvaal. 



A. dimidiata SMITH, Quart. Journ. of Conch, i. p. 348 

 (May, 1878) ; Ann. and Mag. vi, 1890, p. 392. CRAVEN, 

 P. Z. S. 1880, p. 616. 



' ' The species is very readily distinguishable by the strongly 

 contrasting colors of the upper and lower portions" (Smith). 



The specimen figured measures, length 75, diam. 38, aper- 

 ture 441A mm. 



23. C. SCHENCKI (Martens). PI. 5, fig. 1. 



Shell conoid-ovate, thin, rather glossy, irregularly costu- 

 late-striate and sculptured with fine, distant, impressed spiral 

 lines; uniform brown. Apex obtuse, rather thick, whorls 7, 

 the upper ones denuded of cuticle, separated by a slightly 

 crenulate suture, the last whorl with the sculpture evanescent, 

 paler below and towards the aperture. Aperture slightly 

 more than half the length of the shell, bluish within, the 

 columellar margin very arcuate, brownish, obliquely trun- 

 cate. Length 72, diam. 32, aperture 40x25 mm. (Martens). 



S. Africa : Macmac, near Leydenburg, in the Drakensberg 

 region (Dr. A. Schenck). 



