no Prof. E. Forbes on Fossil Invertebrata from Southern India. 



cated and much divided though broad (broader than the lobes). Their extreme 

 divisions are rounded, but not foUaceous. 



Locality, Pondicherry. 



This very distinct Ammonite appears to be rare. It approaches some gault 

 species, and in the form of its back resembles some French Neocomian Ammonites, 

 but is very distinct from all. 



20. Ammonites Pavana, sp. nov. PI. VII. fig. 5. 



A. testa compressa, undulata ; dorso depresso, lateraliter obsolete tuberculato ; tuberculis 

 distantibus ; umbilico angusto, marginibus crenatis ; apertura compressa, superne truncata. 



Diameter 0/^ inch. 



Median diameter of outer whorl . . . O/2 inch. 

 Median thickness Oj^^ i"^^- 



Shell laterally compressed, the last whorl very large and suddenly increasing to 

 the mouth, ornamented with undulated slightly raised ridges, some of which, at 

 regular intervals, are rather larger than the rest, and rise into tubercles at the 

 margin of the sHghtly depressed back. The umbihcus is deep and very narrow, and 

 exposes four or five whorls. The chambers are not seen in the only specimen in 

 the collection. It approaches very nearly to the last species {A. Cunliffei), but 

 differs from specimens of the same size in having no strong tubercles on the 

 whorls, especially near the umbilicus ; the general aspect is also different. It is 

 evidently a young shell, and probably when full-grown exhibits a much squarer 

 back, which, near the mouth, in the specimen before me, is nearly round. 



Locality, Pondicherry. 



Clypeiformi. 



21. Ammonites Siva, sp. nov. PI. 'VII. fig. 6. 



A. testa compressissima, laevigata, angustissime umbilicata, anfractibus coraplanatis, amplex- 

 antibus ; dorso acutissime cultrato, integerrimo ; apertura sagittata. 



Diameter 3i inches. 



Diameter of outer whorl ly'^j inch. 



Thickness Oyjj inch. 



Shell quoit-shaped, the inner whorls concealed, the umbilicus very small. The 

 surface is smooth ; a few fine radiating strise appearing only on the umbilicus. 

 Back compressed and very sharp. Mouth lanceolate. 



The divisions of the septa are numerous but short. The lobes gradually decrease 

 towards the umbilicus. The dorsal lobe is largest. They are more or less irre- 

 gularly bifurcated. The saddles terminate in large phylliform lobules, which are 

 more or less symmetrically arranged, but the terminal lobule is always in advance 



