210 Mr. D. Sharpe on Paleozoic Fossils from South Africa. 



quotes C. sarcinulata from the same formations at the Cape of Good Hope, but we 

 have not found it among our specimens. 



From the Spirifer-rock of the Warm Bokkeveld. 



Some larger specimens of Chonetes ? occur in a nodule of reddish rock from the 

 Warm Bokkeveld, 



Orbicula Bainii, Sharpe. PI. XXVI. figs. 20-23. 



Orbicula, sp., Quart. Journ. Geol. Soc. vol. ii. pi. x. fig. 5. 



O. testa ovato-circulari, depresso-conica, apice excentric&, concentrice subrugata, radiatim 

 subtilissime striata. 



Shell nearly circular, depressed-conical, with the apex slightly excentric, both 

 valves covered with fine concentric wrinkles, which are crossed by very fine 

 radiating striae, scarcely visible to the naked eye. 



Longest diameter 1^ inch ; shortest diameter 1^ inch ; height |ths of an inch. 



Found in black schist at Gydow Pass (with Littorina) ; in soft light-coloured 

 argillaceous rock (with Strophomena Bainii?) at Hottentots Kloof; and in nodules 

 of dark-coloured rock at the Gedarberg (in one instance with Chonetes) ; and found 

 in the Falkland Islands by Mr. C. Darwin. 



Fig, 20 a & &, upper valve of a small specimen ; fig. 20 c, part of the surface of 

 20a, magnified; fig. 21 a & &, upper valve of a larger specimen, which has lost 

 nearly the whole of its shell ; fig. 22, lower valve ; fig. 23 a, fragment of the upper 

 valve with the shell well preserved. 



Solenella antiqua, Sharpe. PI. XXVII. fig. 1. 



S. testa transversim ovata, concentrice rugoso-lineata ; antice rotundato-abbreviatA ; postice 

 subproducta, rotundata, prope dorsum sinuata : cardine subarcuato ; dentibus anterioribus 

 10 parvis, posterioribus numerosis minoribus. 



Shell transversely ovate ; anterior end broad, short, and rounded ; posterior end 

 somewhat produced, broad, with a small sinus near the dorsal margin : valves 

 covered with fine concentric wrinkles : hinge-line slightly arched, with about ten 

 small anterior, and more than twenty very small posterior teeth. 



Length 1^ inch ; breadth 2 J inches ; thickness 1 inch. 



Found at Leo Hoek, in a fine micaceous sandstone. There are five specimens 

 in the collection, four of which have the valves united. 



As the ligament of this and the following species was external, it is obviously 

 incorrect to place them in the genus Nucula ; the small posterior sinus shows their 

 relation to Solenella, and proves them to have had a sinus in the pallial line. 



Fig. la, right valve ; fig. 16, hinge of the same specimen. 



