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V. — Report on the Fossil Invertehrata from Southern India, collected by Mr. 



Kaye and Mr. Cunliffe. 



By EDWARD FORBES, F.R.S., F.G.S. &c., Professor of Botany at King's College, 

 London ; Paleontologist to the Geological Survey of the United Kingdom. 



Part the First. — Description of the Species. 



MOLLUSCA. 



Cephalopoda. 



Genus Nautilus, Linnaeus. 



1 HERE are four well-marked species of this genus in the collection. Two of them 

 appear to be identical with European species, and two are new. The former are 

 cretaceous forms : of the latter, one is nearly allied to a cretaceous and the other 

 to oolitic species. Not one of the specimens is in perfectly good condition, so 

 that the certainty of the determinations may hereafter be questioned. 



I. Nautilus IfEvigatus, D'Orbigny? 



N. testa subglobosa, inflata, laevigata, subumbilicata ; apertur^ orbiculari-lunata ; septis obso- 

 lete undulatis ; siphunculo subcentrali. 



Median diameter, 6 inches. Breadth at base of aperture, 4 inches. 



Shell subglobose, much-inflated, slightly umbilicated, externally smooth ; the 

 mouth suborbicular and lunate. The chambers have a slight tendency to show a 

 sinuated outline. The siphon is a little nearer to the spire than to the back. The 

 spaces between the chambers and the degree of inflation of the entire shell vary in 

 different specimens. Young examples have a very smooth shell. I cannot distin- 

 guish it from the Nautilus lavigatus, except in that the chambers of the French 

 species are usually wider. M. D'Orbigny describes his shell as from the " couches 

 moyennes de la craie, k I'etage des craies tufau et au gres vert." (D'Orb. P. F. 

 Terrains Cretaces, vol. i. p. 84. pi. 17.) 



Locality, Pondicherry. 



