Mr. D. Sharpe on Paleeozoic Fossils from South Africa. 209 



margin : hinge-line of ventral valve straight, equal in length to the greatest width 

 of the shell : ventral valve with a slight elevation near the umbo, below which is 

 a mesial depression extending to the margin. 



Length 1 inch ; breadth If inch. 



Found in the Warm Bokkeveld, in a nodule of ferruginous rock, together with 

 casts of Orthis palmata ; and in black schist and yellowish micaceous sand-rock of 

 the same locality. 



I take the specific characters from the ventral valve, fig. 13 : if fig. 17 represent 

 a dorsal valve, the hinge-area must be small. This shell much resembles Stropho- 

 mena Bechei, M'Coy, sp., Carb. Foss. Ireland, pi. 22. fig. 3. 



Fig. 13, exterior of ventral valve, from a gutta-percha mould of an impression 

 of the shell; fig. 17, exterior of dorsal ? valve, from a similar mould. 



Strophomena Sulivani, Morris & Sharpe, sp. PL XXVI. figs. 18 & 19. 



Orthis Sulivani, Morris & Sharpe, Quart. Journ. Geol. Soc. vol. ii. pi. x. fig. 1. 



S. testa semi-ovata, striata; valva ventrali subplana, dorsali subgibbosa: omnino striis 

 numerosis radiantibus, bifurcantibus, ad marginem 150, lineisque paucis concentricis ornata : 

 area cardinali alta, triangular!, latitudinem valvarum eequante ; foramine clauso. 



Shell semi-ovate ; ventral valve nearly flat, dorsal valve slightly gibbose : sur- 

 face covered with fine sharp bifurcating rays, increasing at the margin to about 

 1 50 in number, and crossed by two or three ill-defined concentric lines : hinge- 

 line nearly of the breadth of the shell : hinge-area high and triangular, with the 

 large triangular foramen covered with a deltidium. 



Width If inch ; length 1^ inch. 



Found in dark-coloured schist and in reddish argillaceous rock in the Warm 

 Bokkeveld ; and also found in the Falkland Islands by Mr. C. Darwin. 



Fig. 18, exterior of the ventral valve and hinge-area of the dorsal valve, from 

 a gutta-percha mould of an impression of the shell ; fig. 19, exterior of the dorsal 

 valve, from a similar mould. 



Chonetes, species undetermined. PI. XVI. fig. 14. 



Interior of the ventral valve, perhaps of the same species as the following. 

 From the Spirifer-rock of the Warm Bokkeveld. 



Chonetes, species undetermined. PI. XVI. figs. 15 & 16. 



These figures probably represent the interior and exterior impressions of the 

 dorsal valve of one species ; but, having no positive proof of this, I have not 

 ventured to name them. They are clearly distinct from Chonetes sarcinulata, 

 Schloth., being much more finely striated than that species. Dr. F. Sandberger 



2 f2 



