Prof. E. Forbes on Fossil Invertebrata from Southern India. 103 



Whorls about five, suddenly increasing, but somewhat compressed, though 

 thick. Surface apparently smooth, becoming interrupted at distant intervals by 

 oval furrows of growth. Umbilicus very narrow but deep, especially within the 

 second whorl. [In its ally, A. Garuda, the outer whorl rises much above the 

 second.] Mouth not dilated, and hence presenting a suborbicular form, some- 

 what oblong from the compression of sides, so as to be longer than wide. [The 

 mouth of A. Garuda is wider than long.] 



Chambers very complicated. Lateral lobes 3 or 4, the superior lateral largest, 

 much-divided, trifurcated, and exceeding in length the dorsal. Dorsal lobe deeply 

 cleft, each division branching into antler-like ramifications. Siphonal saddle ob- 

 long. Dorsal and lateral saddles bifurcated, much-ramified, divisions narrow. The 

 ramifications of the sutures of the chambers in this Ammonite are much more 

 complicated than in A. Garuda of the same size. 



Locality, Pondicherry. 



7. Ammonites Chrishna, sp, nov. PI. IX, fig. 2. 



A. testa compressa, discoidea, la2vigata; anfractibus depressis, 4-5, ultimo radiatim cos- 

 tato, costis dorsaliter obsoletis ; dorso transverse crebrisulcato, sulcis lateraliter obsoletis ; 

 apertura lunata. 



Diameter 4 inches. 



Median diameter of last whorl , . . 1— inch. 



Thickness ly% inch. 



Shell much-depressed, the last whorl gently increasing and leaving the inner 

 whorls exposed, ornamented with ten or eleven radiating curved ribs, which com- 

 mence above the inner margin, and become obsolete before they reach the back. 

 The back is crossed by numerous sulcations, which however are not continued down 

 the sides, but cease suddenly : there are about thirty-one of these on a specimen of 

 the above dimensions. The umbilicus is shallow, and narrow when compared with 

 the breadth of the shell. The mouth appears to have been ovate. 



The lobes of the chambers are about three on each side, and more or less regu- 

 larly trifurcated. The superior lateral is largest, and greatly exceeds the dorsal, 

 which is wide, and terminates in two not very long spreading branches. The 

 saddles are narrow and bifurcated. The lateral is as large as, or exceeds the dorsal. 

 The auxiliary lobes and saddles suddenly decrease. 



This species is related to Ammonites Carteroni, a French Neocomian species. 



Locality, Pondicherry. 



8. Ammonites Ganesa, sp. nov. PI. VII. fig. 8. 



A. testa discoidea, laevigata, dorso rotundato, umbilico profundo, anfractibus 5 ; anfractu 

 ultimo interne costato-tuberculato ; costis 7-8 ; apertura reniformi-subtrigona. 



p2 



