FAUNA OF THE GOSATT FOKMATION". 



675 



produced by the circumstance that the teeth of the lower jaw were 

 received scissor-like between the teeth of the upper jaw ; and these 

 pits I regard as excavations which have resulted from the pressure 

 of their crowns — a view which is especially supported by the cir- 

 cumstance that they are deeper posteriorly, where the palatal border 

 is but little above the outer alveolar border, and are less marked 

 anteriorly, where the palatal border rises about 8 millim. above 

 the alveolar border. The teeth extend along the whole alveolar 

 length, which is 4 J centim., and were eight in number in the 

 fragment. They are larger in front than behind, and mostly ap- 

 pear to have been successional teeth not fully cut. The first, 

 where broken, is 7 millim. long and 4 millim. thick. The second 

 is less than 4 millim. long, and is clearly a section of the fang ; 

 but one of the later teeth shows the sharp serrated cutting-edge, 

 compressed form, and smooth enamel characteristic of the teeth of 

 the lower jaw ; and it is on this evidence that I have felt justified 

 in referring it to the same species. Both fang and crown appear 

 to have been hollow ; but as the cavities are filled with iron pyrites, 

 I have not been able to excavate them. 



There are a few other unimportant fragments, chiefly of the lower 

 jaw, which exhibit similar sculpture, and presumably belong to this 

 genus, but too imperfect to be worthy of description. 



There is a small claw-phalange (PI. XXVII. fig. 26) which, 

 perhaps, for the present may be noticed here, seeing that it is quite 

 impossible to say with certainty to which of the animals it belonged. 

 It is 17 millim. long, curved downward and to the right. It tapers 

 to a point, and is subtriangular, being flattened on the under side, 

 on the left side, and obliquely on the right side, which is large. 

 But these three surfaces round into each other, except where they 

 are divided by the sharp lateral ridges which margin the base. The 

 articulation is 7 millim. deep, a little narrower, concave from above 

 downwards, and convex from side to side. 



E,HAM]srosAUEUs alcimtjs, Seeley. 



I found this genus upon the femora, which are quite distinct from 

 any thing hitherto discovered. The humeri are such as would be 

 associated with those bones, though there is no proof beyond simi- 

 larity of character that they belong to the same species. The same 

 remark applies to the vertebrse, which are such as might be expected 

 in an animal of this kind ; but there is no evidence of natural asso- 

 ciation. I have placed this genus next in succession to Doratodon, 

 because that genus is founded upon a head, while this is formed for 

 limb-bones ; and though there is no evidence to justify their being 

 thrown together, there is a possibility that Doratodon belongs to 

 one of the animals of which the head cannot be identified. 



Humerus. 



Two specimens of humeral bones (PI. XXXI. figs. 8-10) exhibit 

 characters indicative of an animal in many respects unlike any other 



2y2 



