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GO QUARTERLY JOURNAL. 



ing upon the same plantation, still that is a matter we have nothing 

 to do with except to describe accurately what we find. 



But the very interesting and important observations of Profj 

 Owen, on the anatomical structure of the Zeuglodon, apply alsc 

 to many of these bones, viz : the solid double fangs oi the molar 

 teeth — their implantation in separate and distinct sockets ; and tot 

 the jaw", which is hollow. 



But some other important facts I have been able to deter- 

 mine by the specimens in my possession, viz: the convexity oi 

 the condyle, the inward curvature of the angle of the jawJ 

 which projects beyond the condyle, in a manner not very dissim'h 

 lar to that of our hystrix. The angle, the condyle and the coro- 

 noid process of the lower jaw, then, all form one continuous| 

 portion of bone ; thus proving very conclusively that the animan 

 did not possess a jaw of the composite kind or structure. 



It would be interesting to institute a comparison of the jaw o i 

 this animal with the Thylacotherium, unless indeed, the jaw 0(( 

 the latter is supplied with molars too far removed in form an(|j 

 structure to furnish grounds for the admission of affinity — hw* 

 in the figures which are given in Buckland's Bridgewater Treatises 

 the molars are not very dissimilar to those of the seal family. 



There is another fossil whose teeth, especially the crowns, re 

 serable those in my possession ; I allude to the Iguanodon. Boti 

 have serrated edges, but with this character the resemblance ceasesi 

 But as the Iguanodon is supposed to have been a vegetable feeder 

 this resemblance is interesting, inasmuch as it may throw som! 

 light on the nature of the food of our animal ; but still, it is sup 

 plied with large canine teeth, so as seemingly to balance the pro 

 bability of its feeding upon vegetables. Connected too wnth th 

 bones of the head, is a large rounded bone, like the palatine bonef 

 of a fish ; a provision for a more perfect mastication than coul 

 have been made by the cutting grinders as represented in th 

 figures, — provided that this palatine really belonged to the anima 

 in question. It will be seen from the above facts, that w'e hav 

 some very interesting combinations — some anomalies which ar 

 quite as rare as any which have been furnished since the discover 

 of the remains of the sauroid fishes. 



I now proceed to the main object of this paper, viz : to describ 

 the teeth of the animal under consideration. 



