COCHLITOMA. 79 



Groups of South African Cochlitomcz. 



I. Group of C. semidecussata. Chiefly rather slender shells, 

 the spire conspicuously granose-decussate, last whorl 

 costulate or granose. Species 1 to 5. 



II. Group of C. zebra. Ovate or oblong, rather strong, 

 closely zebra-striped with dark or blackish chestnut, the 

 stripes sometimes confluent below; last whorl generally 

 smoothish. Species 6 to 16. 



III. Group of C. varicosa. Ovate or obesely ovate, thin, light 

 shells, usually fiammulate. Species 17 to 21. 



IV. Group of C. dimidiata. Ovate, the spire decussate, last 

 whorl generally smooth and glossy; nearly uniform oli- 

 vaceous, brownish or yellowish, without flames, but usu- 

 ally with a few streaks along growth-lines. 



Species 22 to 31. 



V. Species of uncertain position, some of them perhaps be- 



Species 32 to 34. 



I. Group of C. semidecussata. 



Rather slender shells (except C. granulata), with the apex 

 large and rounded, the spire conspicuously decussate- 

 granulose, the last whorl costulate-striate or granose. Aper- 

 ture and columella whitish. 



1. C. GRANULATA (Krauss). PI. 29, fig. 44. 



Shell fusiform-ovate, solid, brownish or olivaceous yellow, 

 closely marked with reddish-chestnut stripes, part of them 

 more or less zigzag. Closely, finely and strongly striate, de- 

 cussated by more spaced and superficial spirals over the 

 whole surface. The vertical striae are deeper and more re- 

 gular on the spire, recurved and puckered below the suture. 

 Spire regularly tapering, rather slender above, the apex obtuse 

 and rounded. Whorls 8y 2 , moderately convex, the last ob- 

 long. Aperture about half the total length, lilac-white or 

 blue-white within. Columella white, strongly arcuate, com- 

 pressed, its callous narrow and thick, narrowly truncate or 

 sinuous at base. Parietal callous white, thin and transparent 

 towards the outer lip. 



