200 Mr. D. Sharpe on Secondary Fossils from South Africa. 



indistinctly keeled at their lower edge, and crossed by numerous longitudinal 

 undulations. Angle of the spire 50°. 



Length Tnjth of an inch. 



Found in the lowest strata of the Zwartkop crag. 



Turbo Atherstoni, Sharpe. PI. XXVIII. figs. 15 & 16. 



T. testa niinuta, turbinata: anfractibus 4,angulatis; superne planis, longitudinaliter striatis ; 

 medio bicarinatis : angulo spirali 75°. 



Shell minute, turbinated . whorls four, angular ; nearly fiat and longitudinally 

 striated above ; with a broad fiat band round the middle, bounded by two strong 

 keels : angle of the spire 75°. 



Length Yyth of an inch. 



Found in the lowest strata of the Zwartkop crag. 



Turbo Bainii, Sharpe. PI. XXVIII. figs. 17 & 18. 



T. testa minuta, turbinata : anfractibus 4, angulatis, longitudinaliter striatis ; superne planis ; 

 medio tricarinatis ; infra tricarinatis : angulo spirali 65°. 



Shell minute, turbinated : whorls four, angular, and longitudinally striated ; 

 nearly fiat above ; with three strong keels on the exposed middle part and three 

 keels on the lower part : angle of the spire 65°. 



Length |^th of an inch. 



Common in the lowest strata of the Zwartkop crag. 



Since the above description was written, some specimens belonging to this 

 species have been found in brealiing up some greenish grit with Ostrtece from 

 Sunday River. These specimens are larger than the above-described ; the largest 

 is ^ inch in length. 



Acteon Atherstoni, Sharpe. PI. XXVIII. fig. 19. 



A. testa fusiform! : anfractibus 6, rotundatis ; superne planis ; infra transversim impresso- 

 lineatis : angulo spirali 40°. 



Shell fusiform, with six rounded whorls, which are smooth on the upper part 

 and ornamented on the lower part with about fifteen impressed transverse lines : 

 angle of the spire 40°. 



Length ^th of an inch. 



Found in the lowest strata of the Zwartkop crag. 



Natica Atherstoni, Sharpe. PI. XXVIII. fig. 22. 



N. testii oblonga : anfractibus convexis, medio subangulatis longitudinaliter striatis : angulo 

 spirali 75°. 



Shell oblong, finely striated by the lines of growth : whorls four, convex, a little 



