286 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



sented b}^ the articular ends of the femora, tibiae, and fibula?; tarsals, 

 metatarsals, and phalanges; portions of the scapulaj, humeri, and 

 metacarpals. 



In the original paper, JHulke gives a detailed description of the 

 skeletal parts of the holotype. The article in question is of too great 

 length, however, to be wholly incorporated in the present paper, and 

 I shall confine my remarks to a brief review of the chief character- 

 istics, as described and figured by Hulke, in comparison with those of 

 the American species. 



Review of the tyjncal material. — The occipital condyle has the same 

 reniform outline and forward development of the articular area on 

 the ventral surface as found in the American species. Its union with 

 the basisphenoid by a median tongue of bone received in a correspond- 

 ing notch on the posterior end of the latter element, and the pro- 

 nounced winding grooves on the lower and lateral surfaces of the 

 basisphenoid which marks the course of the internal carotid artery, 

 are similar to those in C. cUsiKir. The exoccipitals are perforated by 

 the usual foramina, and, as in C. disjmr., these bones enter slightly into 

 the formation of the occipital condyle. The supra-occipital contri- 

 butes to the upper boundary of the foramen nuignuui, its outline and 

 relationship to the surrounding elements appearing identical with 

 the same bone in C. dispar., as shown in fig. 4. The parietal bone is 

 single, the median crest sharper than in either C. mcdius or C. d'lspar. 

 The frontals are short and broad, and but little, if any, of their outer 

 borders enter into the formation of the orbital cavity. The post- 

 frontal has a smooth orbital surface of great extent. I am unable to 

 detect any differences which would distinguish the teeth of the upper 

 and lower jaws from those of the American forms. An idea of their 

 size may be gleaned from the following measurements : In a piece of 

 the maxillary, in a space of 75 mm., are the sockets of an outer 

 series of nine teeth. The breadth (that is, antero-posterior dimen- 

 sion) of a fully formed upper crown is 9.5 mm. The greatest breadth 

 of the largest lower tooth crown is 12.5 mm., that of other crowns 

 varying between 10 and 11.5 mm. 



Of the twenty-five presacral vertebrae preserved, seven are con- 

 sidered by Hulke as cervical, and, since the atlas and axis are missing, 

 there would be in the complete neck at least nine vertebra\ The 

 opisthocoelous nature of the centra, the presence of the parapophyses 

 on the anterior end of the centra, the deep, lateral depression, and the 

 pronounced median keel, are all characters common to the other mem- 

 bers of the genus. But the angularity of the centra, as viewed from 

 the end, is peculiar to this species. 



In the anterior dorsals it is apparent from Hulke 's description 

 that the transition of the pariipophyses from the centrum in the 



