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



sulcations are seen on the surface of a shell of the above dimensions. In the 

 interior the presence of these sulcations is indicated only on the upper half of the 

 shell. The ribs which separate them are sloping, and rise into tubercles or short 

 spines where they terminate at the margin. This character approaches so nearly 

 that seen in the existing Lucina spinifera, that I have some doubts, in the absence 

 of the hinge, of the shell being a true Astarte. The paUial impression is entire, 

 and the muscular impressions are very strong. 

 Locality, Trinchinopoly. 



Genus Cardita, Brugui^re. 



1. Cardita orbicularis, sp. nov. PI. XVII. fig. 11. 



C. testa orbiculari, convexa, costis longitudinalibus (22) rotundatis (squamosis ?). 

 Length Qif inch. Breadth 0^ inch. 



A single specimen in bad condition, but evidently a very distinct species. Its 

 nearest known aUies are tertiary forms, but the genus extends throughout the Cre- 

 taceous system. 



Locality, Pondicherry. 



2. Cardita striata, sp. nov. PI. XIV. fig. 1. 



C. testa suborbiculari, subdepressa, longitudinaliter costata striataque, costis (30) 4-striatis. 

 Length Oj~ inch. Breadth the same. 



A very distinct species remarkable for its sculpture, the surface being orna- 

 mented with thirty or more radiating ribs, each of which is marked by about four 

 longitudinal strise. 



Locality, Verdachellum. 



Genus Cardium, Linnseus. 



1. Cardium bisectum, sp. nov. PI. XVII. fig. 9. 



C. testa elongata, anguste oblonga, inflata, lateribus subcompressis, concentrice striis minutis 

 ornata, dimidio longitudinaliter striato-sulcata, sulcis subcentralibus (10) majoribus; umboni- 

 bus prominentibus incurvatis. 



Length 2| inches. Breadth 1| inch. Thickness 2j^ inches. 



Remarkable for its elongated, tumid and compressed form, and singular division 

 of the shell into two parts, the one longitudinally sulcated, the other almost smooth. 

 Consequently one-half of the margin only is crenulated. The cast is smooth and 

 shining. Cardium impressum, a Neocomian species described by Deshayes, is 

 distantly related to this form. 



Locality, Pondicherry. 



