496 On the Fossil Bones of the Jamna River. [Sept. 



term rising be understood, I consider this feature is pretty clearly 

 indicated in the larger specimen ; if they do not belong to this 

 animal, I am utterly at a loss how to class them. 



Nos. 14 and 15, I imagine, are portions of the jaws and teeth 

 (broken off at the margins of their alveoli) of some extinct species of 

 the Saurian order, differing in every material point from any species 

 described by Parkinson ; the transverse section of either shewing no 

 cutting ridges, and the longitudinal section of No. 15, plainly shew- 

 ing from their curved formation, the impossibility of the teeth being 

 shed, or renewed, as also the existence of a core without any 

 cavity ; whereas a peculiar feature of the whole crocodile tribe is, 

 the teeth are never solid in the centre. Could the larger one 

 have belonged to that scarce monster, the Bhote of the Jamna ? a 

 species of crocodile, I believe, that has never yet been described. 



Of No. 19, it will be of little use for me to take more notice, than 

 by pointing out what appears to me to have been the outline of the 

 crown of a circular cavity, in the centre of the tooth, which might, 

 when perfect, have contained the nerve. Should this prove to be the 

 case, at least one-third of the tooth must have been broken off, 

 and then the present surface would have been a fracture. The 

 exterior edges all round evidently present a decided fracture ; but the 

 interior surface (so beautifully irregular) has every appearance of the 

 exterior enamel of a perfect tooth. Supposing it to have been arranged 

 in plates (of which however there is not the least trace), the decom- 

 position of the crusta petrosa might have occurred here, as in the 

 elephant ; but the separation (except by force) would have been ren- 

 dered impossible, by the texture of the enamel that surrounds it on 

 three sides, which is sufficiently strong, even had the crusta petrosa 

 been withdrawn, to have held it together. It might be urged, that 

 the exterior substance is not enamel, but an incrustation ; this indeed 

 might hide the disposition of plates ; but I am inclined to believe, that 

 the qualities of the whole and .fractured parts are so intimate, that 

 the position is untenable. 



The teeth marked 0-2, 4, 6, and 1 6, have belonged to animals of the 

 deer and ox tribes, but I have not the means of accurately classing 

 them by comparison or otherwise. 



- No. 44, (fig. 18, PI. xxxiii.) has defied the anatomical abilities of 

 every one who has hitherto seen it. I have been able to form no 

 opinion on it ; never to my recollection having seen any vertebra in 

 the least resembling it, 



