The Invertebrate Fauna of the Uitenhage Series. 163 



CLASS GASTEROPODA. 



GENUS PATELLA Linnseus. 

 PATELLA CAPERATA Tate. 



1867. Patella caperata E. Tate, Quart. Journ. Geol. Soc., vol. xxiii., 

 p. 152, pi. vii., fig. 1. 



Occurrence. A single specimen, on Exogyra imbricata Krauss, 

 from the collection of the South African Museum, was obtained at 

 Coega. Tate's figured specimen, in the collection of the Geological 

 Society (No. 11,003), is labelled " Prince Alfred's Best" (Sunday's 

 Eiver). 



Remarks. The specimen from Coega is more strongly elevated 

 in form than Tate's original type. The apex in both is excentric 

 in position, and as a result of this, the outline from the apex to the 

 margin on the shorter side of the shell falls more steeply than that 

 on the opposite side. Annular markings and growth-lines are more 

 marked on Tate's specimen, because its surface has suffered less from 

 weathering than that of the other individual. 



The figured type of this species measures 28 mm. in longest 

 diameter at the base, and the measurement at right angles to 

 this, across the shortest diameter, is 22 mm. The height is 10 mm. 

 The true dimensions of the Coega specimen cannot be measured 

 satisfactorily because the shell has so suffered from weathering that 

 its original margins are not preserved. There are indications that 

 a firmly established station had been taken up, on the Exogyra. In 

 one place, on the surface of the Exogyra, in the position which the 

 serrated margin of the Patella formerly occupied, there are indenta- 

 tions which correspond with the terminations of the costse on the 

 Patella. 



GENUS PLEUEOTOMAEIA J. L. M. Defrance. 



PLEUROTOMABIA sp. 



Description. A large, ill-preserved and much-weathered specimen 

 consists of at least five whorls. The body- whorl is flattened on its 

 under side and its outer margin is obtusely angular ; the surface of 

 the whorl above this margin is very slightly convex. The suture 

 falls at the bluntly angular margin of the whorls, so that the general 

 figure of the shell in profile is that of a cone with little excavation at 

 the sutural depressions and inconspicuous convexity of the outline 



