Prof. E. Forbes on Fossil Invertebrata from Southern India. 147 



This shell varies in degree of convexity. It approaches certain species of 

 Artemis in outline. Mr. G. B. Sowerby regarded it as a variety of the Cytherea 

 semisulcata of Lamarck, a fossil of the Paris basin. There are sufficient differences 

 however to lead us to infer that were colour present — a character so important in 

 this genus that very similar fossil forms from different beds can never be iden- 

 tified with certainty — we should find the Indian very different from the French 

 species. 



Locality, Trinchinopoly. 



2. Venus analoga, sp. nov. PI. XV. fig. 20. 



V. testd transverse oblonga, depressa, inaequilaterali, laevi seu substriata, margine laevi, 



umbonibus obtusis, lunula (occulta). 



Length Oy^g inch. Breadth 0^-^ inch. Height of a valve Oy^o inch. 



An ovate, depressed, smooth and polished species gracefully rounded at the 

 extremities. The surface is marked by obsolete striae of growth. Compared by 

 Mr. G. B. Sowerby with the Cytherea nitidula of Deshayes, an eocene fossil. 



Locality, Trinchinopoly. 



3. Venus eximia, sp. nov. PI. XV. fig. 21. " . 



V. testa transverse ovata, subaequilaterali, depressa, polita, concentrice regulariter sulcato- 

 striata, marginibus Isevibus, umbonibus prominentibus, parvis, lunula oblonga. 

 Length 0^^ inch. Breadth 1 inch. Height of a valve Oy% inch. 



A much-depressed oblong shell, beautifully marked by deep, close and regular 

 concentric striations. The anteal cardinal margin slopes suddenly and obliquely, 

 so as in young specimens to give an angular appearance to the outline ; the beaks 

 are small but very prominent. Considered by Mr. G. B. Sowerby identical with 

 the eocene Cytherea elegans of Lamarck. There are however sufficient distinctions 

 to keep them apart, independent of the improbability of their being identical. 



Locality, Trinchinopoly. 



Genus Artemis, Poli. 

 1. Artemis lenticularis , sp. nov. PI. XVIII. fig. 7. 



A. testa orbiculari, depressa, concentrice regulariter striata, margine vaginali arcuato-obliqua. 

 Length and breadth Oyi inch. 



The above characters are scarcely sufficient to separate this species from an 

 existing Artemis of the European seas, Artemis lincta, yet we can scarcely doubt 

 that they are very distinct from each other. The curve of the vagino-cardinal 

 margin is different, and this character in the genus Artemis usually accompanies 

 others of importance. Most probably the colour of the species when alive — a 



