ADDITIONS AND COKRECTIONS. 



377 



is indicated by the longitudinal carina in the vertex of the Cape spe- 

 cies, there being no trace of such carina in either of my specimens. 



" Unfortiniatoly the tympanic bones are 'wanting in both, and I 

 can tell you nothing of them. But the zygomatic bone is preserved, 

 and is of the same form as that figured in Cuvier's work, figs. 1 and 

 3, but somewhat smaller than the latter figure. 



" The seven cervical vertebrae are free, separate from each other, 

 and the body of every one has the epiph3'ses on each side, the sjiccimen 

 being that of a young individual. But in the atlas and front side of 

 the axis these epiphyses do not exist. I send you drawings of the first 

 (fig. 77), the second (fig. 78), the fourth (fig. 79), and the sixth (fig. 80) 



Fig. 80. 



Sixth cervical vertebra. 



vertebrae : the third exactly resembles the foui-th ; and the fifth only 

 differs in a small opening in the lateral arc, indicated in my di-awing 

 of the fourth, on the left side. The seventh has no inferior process 

 at all, but a much stronger superior one, of the same form. All the 

 five vertebra after the second are very thin, 2 inches in diameter, — 

 the third being the thinnest of all, and the following ones somewhat 

 thicker ; the seventh is 2^ inches in thickness. 



" Of costal or dorsal vertebra we have fourteen, very well indicated 

 by the flattened ends of the transverse processes being united with 

 the ribs. The first of these dorsal vertebrae is very thin, 3 inches in 

 diameter ; and the second somewhat thicker, 3| inches ; after these 

 the bodies are much stronger, from G to 8 inches in diameter. The 

 three first dorsal vertebra} have transverse processes more rounded, 

 and directed forward. After the third they are more flat and broad, 

 and directed transversely to the sides. After these fourteen vertebra^ 

 follow twehe others with thinner transverse processes, rounded and 



