660 



PROF. H. G. SEELE3T ON THE REPTILE 



side. The bone measures from back to front at the proximal end 3|- 

 inches, while the middle of the shaft measures 1|- inch, and the distal 

 end 1| inch. The whole inner surface is remarkably flattened, and, 

 except for the usual distal widening, shows no character that calls 

 for remark. The posterior aspect is badly defined, somewhat flat- 

 tened towards the distal end, where the bone is rough with muscular 

 markings, and 1^ inch from side to side. The thickness in the 

 middle of the shaft is apparently less, though the bone may be some- 

 what compressed ; and the thickness varies in the two specimens. In 

 length, the posterior outline is slightly concave in the middle of the 

 shaft, and slightly convex in its upper portion, where it is well 

 rounded from side to side. The outer surface of the bone is convex 

 from back to front, and slightly concave in length. It becomes 

 compressed proximally ; so that it is divided by an elevated median 

 ridge into two portions — the posterior somewhat flattened and look- 

 ing obliquely outward and backward, while the anterior half is 

 deeply concave, the concavity resulting from the natural compres- 

 sion of the shaft anteriorly, so as to form an immense patelloid 

 crest something after the pattern of that figured by Leidy as cha- 

 racterizing Ccdosaurus. The anterior margin is somewhat sharp, 

 and is defined at the distal end by a slight angular ridge, which above 

 the middle of the shaft extends inward ; so that the proximal por- 

 tion of the anterior outline becomes convex from side to side, though 

 the side-to-side compression increases, and the bone, where frac- 

 tured, is again increasing in width from side to side, and measures 

 h inch. The upper part of the shaft has a sub triangular section, 

 owing to the elevation of the external or fibular ridge. Fibulas of 

 two sizes occur ; but the larger specimen is so small that I have 

 noticed it under the next species. 



Ckatjeomus lepidophorus, Seeley. 

 In. grouping together the remains which are now to be described 

 I have been influenced partly by their anatomical characters, partly 

 by size, and partly by the fact that I have no evidence of the limb- 

 bones of a third species of the same genus to which any of the 

 bones might be referred. The specific distinctness of this smaller 

 Dinosaur will be found well indicated by the characters of the 

 scapula, humerus, femur, and vertebra. The armour is probably 

 undistinguishable from that of the larger species ; and at present 

 there is no sufficient ground for saying how much of that already 

 described belonged to Cratceomus lepidophorus. 



Left Coracoid. 

 (See Biinzel, pi. iv. fig. 3.) 

 The left coracoid is very imperfectly preserved, giving no indica- 

 tion of the outline of the bone, no trace, or even indication of direc- 

 tion, of its union with the scapula, and showing the articular surface 

 for the humerus but imperfectly. The bone, however, is perfectly 

 recognizable ; it has been figured by Biinzel as the right side of 

 the ilium of Iguanodon Mantelli. Since no other example of a 



