Mr. D. Sharpe on Paleeozoic Fossils from South Africa. 21 1 



Solenella rudis, Sharpe. PI. XXVII. fig. 6. 



S. testa transversim rhomboideo-ovata ; concentrice lineati et corrugata ; antice rotundato- 

 abbreviata ; postice ad dorsum subproducta, marginem ventralem versus truncata et sinuate. 



Shell transversely rhomboido-ovate ; anterior end broad, short, and rounded ; 

 posterior end broad, a little produced near the back, and diagonally truncated 

 with a small sinus near the ventral margin : a slight depression extending from the 

 umbo to the middle of the ventral margin : valves with fine concentric lines and a 

 few unequal concentric wrinkles. 



Length 1^ inch ; breadth 2 inches. 



Found at Hottentots Kloof, in a light-coloured soft micaceous rock. This is 

 the most abundant of the palaeozoic lamellibranchiate species in this collection ; of 

 the others there are often but one or two specimens, of this there are above twenty. 

 Two-thirds are separate valves, and one-third consists of specimens having the 

 valves united. 



Cleidophorus, Hall. 



Gen. Char. An equivalved, inequilateral, lamellibranchiate bivalve, transversely 

 oblong : hinge nearly straight, with numerous small crenulations, extending on 

 both sides of the umbo : ligament external : each valve furnished internally with 

 a strong plate in front of the beak and behind the anterior adductor. 



I have followed the authority of Mr. Salter and Mr. Morris in uniting together 

 the genera Cleidophorus of Hall and Cucullella of M'Coy, which were stated to 

 diflTer in the former having no teeth in the hinge, and the latter having the 

 " hinge-line entirely crenulated." This is done on the supposition that Mr. Hall's 

 specimens were not in a condition to show the hinge, a case unfortunately only 

 too common among the fossil bivalves from the palaeozoic rocks. 



Cleidophorus Africanus, Salter, MSS. PI. XXVH. figs. 2 & 4. 



C. testa transversim elongato-ovali, concentric^ inaequaliter subcorrugat^ : lamina internS 

 magna : cardine recto, dentibus minutis, verticalibus, numerosissimis. 



Shell transversely elongato-oval, covered with unequal and irregular concentric 

 lines and wrinkles: internal plate large: hinge straight; teeth small, vertical, 

 and very numerous. 



The condition of the specimens does not admit of an accurate description of the 

 external form. This is the largest species yet known of the genus. 



Length 1^ inch ; breadth 2^ inches. 



Found at Cedarberg by Dr. A. Smith, and by Mr. Bain in the dark-coloured 

 schist of Gydow Pass, Bokkeveld, South Africa. 



