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



lateribus sulcatis; anfractibus complanatis, ad umbilicum abruptis (apertura oblonga, com- 



pressa). 



Diameter ? 



Diameter of outer whorl 0| inch. 



Diameter of exposed part of second volution Oj^g inch. 



A second but imperfect specimen in Mr. CunlifFe's collection measures about 

 three inches in diameter. The best-preserved specimen of this very remark- 

 able Ammonite is a small one, unfortunately broken, but what remains is very 

 perfect. The whorls are smooth, extremely compressed ; the outer one sloping off 

 to the keel ; abruptly and perpendicularly depressed at its umbilical margin, which 

 is also the case with the perfectly flat second whorl. The keel which encircles the 

 back is strongest towards the mouth, and almost obsolete on the inner whorls. It 

 is of a pentagonal form, its sides being hollowed out by two grooves. These 

 grooves are obliquely striated, and the striae are finely punctate. On the cast 

 the keel is rounded and the grooves are punctate only. The mouth was probably 

 oblong and compressed. There are oblique distant sulcations on the cast indi- 

 cating temporary mouths. 



The chambers, so far as seen, present two large but narrow lateral lobes, which 

 are regularly and deeply trifurcated at their extremities. The superior lateral is 

 much the largest, and extends beyond the deeply bifurcated and wide dorsal. The 

 saddles are narrow and bilobed at their extremities ; they do not expand so widely 

 as the lobes. 



Locality, Pondicherry. 



In the Verdachellum collection are four species of Ammonites ; of these, two 

 {A. Buddha and A. Sugata) belong to the section Heterophylli, or perhaps to the 

 section of which I have made A. Rembda the type, and two to the Ligati {A. Gau- 

 dama and A. Sacya) ; the sections to which all belong indicate a cretaceous age for 

 the beds in which they are found. 1 have named the Verdachellum Ammonites 

 after Buddhist deities, and the greater number of the Pondicherry species after 

 Brahminical gods. In so large a genus as Ammonites mere descriptive names 

 become inappropriate, since no epithet of that kind can be used which may 

 not apply to many species. Hence such an artificial nomenclature as that I have 

 here adopted becomes not only excusable but convenient, since it indicates, with- 

 out too strongly insisting on, the geographical region in which the species are found. 



24. Ammonites Buddha, sp. nov. PI. XIV. fig. 9. 



A. testa depressa, polita, laevigata, anfractibus amplexantibus ; radiato-sulcata, costis inter- 

 mediis regularibus, latis, rotundatis, supra dorsum continuis, dorso rotundato. 



Breadth of last whorl 2 inches. 



Thickness 1^ inch. 



