Prof. E. Forbes on Fossil Invertehrata from Southern India. 149 



posticc rotundatft, margine frontali subtruncato ; area cardinal! lanceolata, umbonibus promi- 

 nentibus. 



Length 0|§ inch. Breadth 0|i inch. Thickness 0|^ inch. Distance between beaks O^^j 

 inch. Breadth of area Og^^ inch. 



A smooth moderately-inflated form with a lanceolate cardinal area. It is nearly 

 allied to the Area ligeriensis of D'Orbigny, a French Craie chloritee species. 

 Locality, Pondicherr3^ 



3. Area brahminica, sp. nov. PI. XVI. fig. 1. 



A. testa subinflata, obsolete carinata, transversim subquadrat^, laevigata, antice oblique sub- 

 truncate, ])ostice rotundata, margine frontali rotundato, area cardinali angustissima, umbonibus 

 approximatis. 



Length 2^ inches. Breadth 3 inches. Thickness (valves united) 2 inches. Distance between 

 beaks 0/:^ inch. Breadth of area Of inch. 



The small area, as compared with the size of the shell, and the peculiar outline 

 sufficiently distinguish this Ark. The surface bears traces of longitudinal striee and 

 lines of growth. It is allied to European upper greensand forms. 



Locality, Pondicherry. 



4. Area Clellandi, sp. nov. PI. XVI. fig. 4. 



A. testa compressa, antice rotundata, postice oblique truncata, angulata, post angulura Isevi- 

 gata, reliqu^ testa regulariter radiato-sulcat^, area angustissima, umbonibus approximatis. 

 Length 0/q inch. Breadth 0^ j inch. 



The surface of this shell and of the cast is marked by twenty-five radiating 

 furrows, each twice as broad as the intermediate ribs. The space behind the 

 angle is nearly smooth, or slightly marked by transverse furrows of growth. The 

 posteal angle of the cardinal margin is very sharp. The dentition is obscure. 



Locality, Pondicherry ; a single specimen. 



5. Area abrupta, sp. nov. PI. XIV. fig. 2, 



A. testa intlata, gibba, oblique trigona, abrupte truncata, forte carinata, carina elevata, lon- 

 gitudinaliter concentriceque striata, umbonibus approximatis, prominentibus. 

 Length 3 inches. Breadth the same. Height of a single valve li inch. 



A remarkable gibbous triangular species, very abruptly truncate and carinate. 

 The keel is elevated and the highest part of the shell. The truncation is marked 

 by an obscure curved sulcus. It is allied to the Area decussata and Area fibrosa 

 of the upper greensand of Blackdown, but is more sharply keeled and triangular 

 than either. Area Beaumontii of the French Craie chloritee is also its near ally. 



Locality, Verdachellum. 



VOL. VII. SECOND SERIES. X 



