642 



PROF. H. G. SEELET ON TELE REPTILE 



base of the cinguloid thickening on the opposite side is convex in 

 the middle and concave at the sides. Both these teeth are marked 

 with slight rough ridges (PI. XXYTI. figs. 15, 16), which are not 

 continuous to the cutting-edge, and are vertical, and much more 

 marked on one tooth than on the other. Of the two other speci- 

 mens which have the attached side of the crown flat, one, though 

 but badly preserved, is remarkable for showing a few faint and 

 vertical serrations, which are equally marked on both sides (fig. 12). 

 They did not exceed five in number on each of the cutting-edges, 

 though only one of these is preserved. All these teeth, I suppose, 

 may belorg to one species. 



There remain two other teeth, which, perhaps, may belong to a 

 second species or may be worn down. They are characterized 

 by the same general features as those already described, but had 

 the crown remarkably low, relatively broad, and hardly making 

 any approach to a triangular form. The tooth is very thick at 

 the base of the crown ; and the cinguloid thickening extends along 

 both sides. The crown is smooth, and shows no trace of serration. 



I am inclined to refer these teeth to Cratceomus ; they pro- 

 bably belong to the species described. 



Cratjeomus Pawlowitschii, Seeley. 

 Vertebral Column. 

 The vertebral column which I refer to Cratceomus is chiefly re- 

 presented by the tail, of which there are about eighteen vertebrae 

 preserved ; and the series is very imperfect. There are slight differ- 

 ences of mineralization in these specimens, some being red, others 

 brownish, and some nearly black ; and there are slight differences in 

 preservation, since some have the articular margins of the vertebras 

 rubbed away, and the processes more or less broken, and others 

 are better preserved but somewhat crushed. Still, when the series 

 is arranged in sequence there is a perfect continuity of character 

 and no evidence to suggest that the remains belong to more than 

 one species, or indeed that they may not all have pertained to a 

 single individual. A curious feature, also observed in some of the 

 English Cretaceous Dinosaurs, is the circumstance that these caudal 

 vertebrae scarcely vary in absolute length, though the centrums 

 diminish in size. Hitherto no trace of the sacrum has been found. 

 The dorsal region is represented by two vertebrae, which show the 

 forms of the processes ; while the cervical region is represented by 

 a vertebra from the hinder part of the neck. In the absence of 

 evidence of another vertebral column, it may be legitimate to refer 

 these vertebras to the same species as the tail ; and from the 

 similarity of size it is not unlikly that the whole of these vertebral 

 remains are the spoils of a single animal, the Cratceomus Pawlo- 

 ivitschii. 



Cervical Vertebra. 

 (See Biinzel, pi. ii. figs. 9, 10.) 



The centrum and neural arch are both preserved; but the neural 



