154 



697. The right tibia of a Gavial : its upper head is large and triangular : its lower 



end is compressed and convex. 



698. The right fibula of a Gavial : this is slender and cylindrical : its head is much 



compressed : its lower end enlarged and subtriangular. 



699. Two of the tarsal bones of a Gavial : a is the astragalus and c the calcaneum. 



700. The left femur of the same Gavial, in longitudinal section. 



701. The left tibia of the same Gavial, in longitudinal section. 



702. The skull of the Gavialis gangeticus, with the dried integuments; showing the 



peculiar valve which defends and closes the external nostril. Number of 

 alveoli in the premaxillary, 5 5 ; in the maxillary, 24 24 ; in the dentary, 

 2525. Presented by Nathaniel WallicJt, M.D., F.S.S. 



703. The skull, wanting the lower jaw, of the Gavialis gangeticus. Number of 



alveoli in the premaxillary, 5 5 ; in the maxillary, 24 24. Hunterian. 



704. The skull of the Gavialis gangeticus. 



Presented by Nathaniel WalUcli, M.D., F.R.S 



705. The skull, with the cranium mutilated and the integuments dried, of a smaller 



specimen of the Gavialis gangeticus. There is a palpebral ossicle at the supe- 

 rior and anterior border of the orbit. Number of alveoli in the premaxillary, 

 5 5 ; in the maxillary, 2323 ; in the dentary, 2626. 



-' f ' Presented by Sir T. S. Raffles, P.Z.S. 



706. The skull of a Gavialis gangeticus, of exactly the same size as the preceding 



specimen, vertically and longitudinally bisected. 



It shows the size and form of the cranial cavity, and the prominence formed by the oto- 

 cranial plates of the alisphenoid, exoccipital and superoccipital bones. These have been par- 

 tially removed in the right half of the section. In the left half is shown the junction of the 

 two canals from the tympanic cavity with each other and with the common median eusta- 

 chian outlet. There is a very feeble rudiment of the expansion of the pterygoid bone in 

 these small Gavials ; but this may be a character of immaturity, not of specific distinction. 



Presented by E. Evarest, Esq. 



