Prof. E. Forbes on Fossil Invertebrata from Southern India. 101 



have their backs smooth and all the whorls tubercled. [This character especially 

 distinguishes A. Brahma from A. Vishnu.] 



The sutures of the chambers resemble those of A. Vishnu. The dorsal lobe is 

 very large and ramified, much exceeding the superior lateral, which is bifurcated. 

 The saddles are in pairs, three or four in number, and much-branched. The line 

 of lobes is very oblique. 



Locality, Pondicherry. 



Ligati. 



3. Ammonites Juilleti ? PI. VII. fig. 2. 



A. Juilleti, D'Orbigny, Pal. Fr. Ter. Cr. i. p. 156. pi. 50. f. 1-3 ? 



A. testa suborbiculari, laevigata, umbilicata ; anfractibus 5 rotundatis ; apertura circulari. 



Dimensions of Pondicherry Dimensions of a French 



specimen. specimen. 



Breadth Oi| inch Oy^ inch. 



Breadth of outer whorl at the mouth Of | inch 0-^^ inch. 



Breadth of outer whorl at the com- 

 mencement of the second . . . Oyl inch 0-^^ inch. 



Breadth of umbilicus Oy| inch 0^^ inch. 



The above dimensions present the chief differences between an Indian specimen 

 and one from Castellane (in Mr. Pratt's collection) nearly of the same size. The 

 shell is suborbicular and rather tumid ; the umbilicus deep ; the whorls 5, rounded 

 and apparently smooth. [M. D'Orbigny in a supplementary note on A. Juilleti 

 speaks of striated specimens.] The aperture is circular. 



The chambers are very much divided. The lateral lobes are two, deeply cleft 

 and bifurcated, especially the superior one, which however is scarcely so long as 

 the deeply divided and much-ramified dorsal. The saddles are deeply bilobed, the 

 dorsal one, which is largest, most regularly. The divisions of the chambers in the 

 Indian species very closely resemble those in the French species. For the present, 

 I cannot safely separate the one from the other. The French A. Jeannoti is described 

 by M. D'Orbigny from specimens collected near Gap, in Neocomian marls. 



Locality, Pondicherry. 



4. Ammonites Kayei, sp. nov. PI. VIII. fig. 3. 



A. testa discoidea, depressa, late umbilicata, transversim striata sulcataque, striis minutissi- 

 mis obliquis ; sulcis distantibus paucis ; anfractibus 8 planiusculis ; apertura reniformi. 



Diameter 2/^ inches. 



Diameter of umbilicus 1 j% inch. 



Thickness of outer whorl .... 0/^ inch. 



Shell discoid and resembling a Planorbis in shape ; remarkable for the wide con> 



VOL. VII. — SECOND SERIES. P 



