228 Mr. D. Sharpe and Mr. Salter on Fossils from South Africa. 



EXPLANATION OF PLATES XXIL— XXVIIL 



Plate XXIL 



Fig. 1. Pinna Atherstoni, Sharpe. From Sunday River, p. 193. 

 1 a. Cast, with some of the shell remaining. 



I b. Transverse section of the anterior part. 



Figs. 2 & 3. Modiola Bainii, Sharpe. From Sunday River, p. 193. 

 2. Fragment of a large specimen. 

 3 a. Fragment of a young shell. 



3 b. Transverse section of fig. 3 a. 



Fig. 4. Perna Atherstoni, Sharpe. From Geelhoutboom, Sunday River, p. 193. 

 4. Left valve. 



4 a. Interior of the right valve of another specimen. 

 4 b. Anterior side of fig. 4. 



Fig. 5. Trigonia Vau, Sharpe. From Sunday River, p. 194. 



Figs. 6 a Si, 6 b. Pholadomya Dominicalis, Sharpe. From Sunday River, p. 194. 



Figs. *] a h *] b. Myacites} Bainii, Sharpe. From Sunday River, p. 195. 



Fig. 8. Ceromya papyracea, Sharpe. From Zwartkop River, p. 195. 



Fig. 9. Cyprina rugulosa, Sharpe. From Zwartkop River, p. 195. 



9 a. Exterior of the left valve. 



9 b. Hinge of the left valve. 

 Fig. 10. Area Atherstoni, Sharpe. From Sunday River, p. 196. 

 Fig. 11. Psammobia Atherstoni, Sharpe. From Sunday River, p. 196. 



11a. Cast of the impression of the left valve. 



I I 6 & 1 1 c. Internal cast. 



Plate XXIII. 



Figs. 1 a & 1 i. Ammonites Atherstoni, Sharpe. From Sunday River. Reduced to two-thirds its 



diameter, p. 196. 

 Figs. 2a & 2b. Ammonites Bainii, Sharpe. From Sunday River, p. 197. 

 Fig. 3. Gryphesa imbricata, Krauss sp. From Sunday River, p. 197. 



3«. Side view of the valves united. Sb. Exterior of the upper valve. 

 Fig. 4. Gastrochcena Dominicalis, Sharpe. From Sunday River, p. 198. 



A a. Fragment of wood* perforated by Gastrochcence. 



4b. Dorsal view of the valves, magnified two diameters. 

 Fig. 5. Neritopsis} turbinata, Sharpe. From Sunday River, p. 198. 



. Plate XXIV. 



Homalonotus Herschelii, Murchison. p. 215. 



Fig. 1 a. The head, with the crust preserved. From Leo Hoek. 

 1 b. The same specimen, side view. 



1 c. The oval space beneath the eye ; magnified, to show that it is granulated like the rest 

 of the head. 



* This is by mistake described as " bone " at p. 198. 



