66 PKOCEEDINGS Of THE GEOLOGICAL SOCIETY. [DcC. 7, 



Pecxen ariNQiTECosTATus, Sow. 



Very numerous in this locality, resembling in every respect the 

 specimen from Pondicherry in Mr. Forbes's Collection in the Geo- 

 logical Society's Museum. 



Number of specimens obtained by me, 11. 



Locality. Umtamfuna river, bed e. 



Pecten amapondensis, nov. sp. PI. III. fig. 7. 



The right valve very slightly concave, finely striated concen- 

 trically, with broader radial ribs. Towards the end of the valve, 

 two distinct concentric lines, which divide the surface of the valve 

 into two or three areas. 



Locality. Umtamfuna river, bed e. 



AECADiE. 



Arca capensis, nov. sp. PL III. fig. 10. 



The valves very thick, surface nearly smooth, very slightly can- 

 cellated, margins smooth. Hinge-teeth numerous, the lateral ones 

 very strong. The ligamental area with numerous but very narrow 

 grooves ; for the cartilage is much smaller than in Area natalensis, 

 and the interior umbones nearly touch each other in closed valves. 

 Area trichinopolitensis, Forbes, is very nearly allied to this species. 

 Mr. Baily's figure of Arca umzambaniensis does not suffice to enable 

 me to decide positively whether the present species is distinct from 

 it ; but it seems to me that Mr. Baily's figure represents a much 

 flatter specimen than mine. 



Number of specimens 9. 



Locality. Umtamfuna river, bed e. 



Pectttncxtltjs AEKiCANtrs, nov. sp. PI. III. fig. 8. 



A small bivalve ; length about from |-| of an inch. Surface finely 

 radiately striated, showing lines of growth ; margins denticulated ; 

 hinge semicircular, teeth transverse ; ligamental area very small. 

 This species is most nearly related to P. subaurictdatus from Pondi- 

 cherry (see Mr. Kaye's Collection) ; but the latter is more circular in 

 form than P. africanus. 



Number of specimens collected, 41. 



Locality. Umtamfuna river, bed e. 



Teigoniad^e. 



Teigonia Shepstonei, nov. spec. PL III. fig. 11. 



This species stands between Trigonia crenulata and scabra, Lamk. 

 The sTirface shows strong lines of growth, with thick transverse ribs, 

 which run quite straight from the beak to the margin, and form 

 right angles with the ventral margin. The ribs have very pro- 



