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



The surface appears to have been quite smooth. The umbihcus is very small, and 

 not so deep as in the last species. The mouth is ovate and lunate, through the 

 projection of the returning whorl. 



The divisions of the partitions are numerous and short. The lateral lobes are 

 seven or eight in number, trifurcated, though but slightly divided, much-dentated 

 and separated by secondary lobes. The dorsal lobe is nearly as long as the supe- 

 rior lateral and broader, bifurcated, each furcation trifurcated and widely spreading. 

 The saddles are bifurcated and their divisions are phylliform. 



This Ammonite is very nearly allied to A. diphyllus, a French Neocomian 

 species from Senez, and also to A. picturatus from the same locality, but I cannot 

 safely identify it with either. I have compared it with specimens of A. diphyllus in 

 the collection of Mr. Pratt. 



Locality, Pondicherry. 



13. Ammonites Surya, sp. nov. PI. VII. fig. 10. 



A. testa compressa, undulata, transversim regulariter sulcato- striata; striis ad umbilicum 

 obsoletis ; umbilico angustissimo ; dorso rotundato ; apertura elongata, compressa. 



Diameter 2f inches. 



Diameter of outer whorl (largest specimen) 1^ inch. 

 Median thickness Oi§ inch. 



Shell discoid, much-compressed, so that in young specimens the back has an 

 approach to carination, the outer whorl embracing all the others so as to leave but 

 a very small umbilicus, from which proceed strong undulating ribs, which become 

 obsolete just before they reach the back. The back itself (rounded in adult ex- 

 amples) is crossed by deep regular striae, which run down the sides on and be- 

 tween the ribs, and become obsolete just before they reach the umbilicus. The 

 mouth is oblong and compressed. The chambers (as seen through the shell of the 

 largest specimen) are very complicated. The lateral lobes are five or six in num- 

 ber, long, slender, ramifying, and trifurcated ; the superior lateral much exceeds 

 the dorsal. The saddles are two-branched, the branches much-ramified, the rami- 

 fications terminating in ovate phylliform lobules. 



A species of the same group with the last, but very distinct from any European 

 forms. Ammonites difficilis, a French Neocomian species, figured by D'Orbigny 

 from the Basses Alpes, is perhaps its nearest known ally. 



Locality, Pondicherry. 



14. Ammonites Nera, sp. nov. PI. VIII. fig. 7. 



A. testa valde compressa, umbilicata, anfractibus amplexantibus planis, ultimo transverse 

 striata, striis tenuissimis, regularibus, continuis, simplicibus, ad umbilicum obsoletis ; dorso 

 rotundato ; apertura oblonga, compressa. 



