460 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 18, 



costse and striae of growth. The phcations of the columella are not 

 exposed. 



This species is nearly related to Valuta cincta, Sowerby, from 

 Pondicherry. 



Locality. — Cliffs of the coast near the Umtafuna and Umzambani 

 Rivers, S. Africa. 



Genus Natica, Lamarck. 



Natica multistriata, nov. sp. PI. XII. fig. 8. 



N. testa subconica ; spira elata ; anfractibus 5, convexis, trans ver- 

 sim striatis ; apertura oblique ovata. 



Length, ^^ths of an inch. 

 Breadth, -j^ths of an inch. 



Shell subconical ; spire elevated ; whorls 5, rounded, with nume- 

 rous transverse striations ; mouth obliquely ovate. 



This form is nearly related to Natica pagoda^ from Pondicherry. 



Locality. — Cliffs of the coast of S. Africa, near the Umtafuna 

 and Umzambani Rivers. 



Several small Gasteropoda, which have been obtained in clearing 

 out the larger fossils, appear to belong to the genera Trochus, 

 Phasianella, and Natica. They are mostly too obscure, however, 

 for specific determination. 



Lamellibranchiata. 



Genus Cardium, Linnaeus. 



Carditjm denticulatum, nov. sp. PL XIII. fig. 4. 



C. testa suborbiculata, convexa, antice rotundata, postice truncata ; 

 transversim costatis, costis 34, elevatis, imbricatis, et denticulatis ; 

 interstitiis concentrice striatis. 



Length, j^ths of an inch. 

 Breadth, ^ths of an inch. 



Shell suborbicular, convex, anterior side rounded, posterior trun- 

 cated ; ribs about 34, angular, and elevated, with scale-like markings 

 and concentric striae between ; posterior margin deeply indented by 

 the sharp ribs. 



This small Cardium^ which is beautifully preserved, is very unlike 

 any other known fossil species, the deeply serrated posterior margin 

 distinguishing it from all others, and giving it a greater resemblance 

 to living forms. 



Locality. — Cliffs on S. African coast, near the Umtafuna and Um- 

 zambani Rivers. 



Genus Arc a, Linnaeus. 



Arca Umzambaniensis, nov. sp. PI. XIII. fig. 1. 



A. testa inflata, gibba, oblique trigona, abrupte truncata, fortiter 



