FOSSIL REPTILES. 243 



an inch. In the gavial, when the articular part has been re- 

 moved, as here, they are, on the contrary, shorter by one-third ; 

 and even, adding this part, they are shorter by a sixth. 



They do not form together so open an angle as in the gavial. 

 Theirs is about thirty and some degrees. That of the gavial 

 is nearly sixty, taking these two angles within and between the 

 lines which the internal edges of the branches form. 



For the same reason, they separate less from the external 

 line of the symphysis, and almost appear prolongations of it. 

 In the gavial they remove from it by a much more sensible 

 inflexion. 



The upper face of this jaw is hollowed by a middle and two 

 lateral furrows, which approach each other in front. It is 

 smooth in the gavial. 



The transverse diameter near the anterior third of the sym- 

 physis does not exceed by quite one-fifth the vertical diameter. 

 In the gavial it is almost double. The emargination which 

 separates the branches penetrates more forward between the 

 teeth than in the gavial. There are seven teeth on each branch; 

 in the gavial there are but two or three. Nevertheless, the 

 entire number is less ; for there are but two-and-twenty on 

 each side, while the gavial has five or even six-and-twenty. 

 Finally, there does not appear to have been any oval foramen 

 on the external face of the branch. 



In the same strata were found fragments of another lower 

 jaw, much more approximating to that of gavial. If not gavial, 

 it is certainly distinct from the last. Another fragment, 

 apparently from the same species, was found near Auxerre. It 

 was remarkable for its size, and the resemblance of its propor- 

 tions to those of gavial. The Baron thinks the individual to 

 which it belonged might have been seventeen feet and a half in 

 length. 



These two lower jaws suggested to M. Cuvier that two spe- 

 cies might exist at Honfleur. By great chance he got together 

 six pieces which had belonged to the same cranium, and by 



R 2 



