282 



at base. It is curved conical, feebly compressed from without inwardly, and 

 has its inner and outer surfaces well defined b.y acute borders. The exposed 

 inner surface of the crown exhibits no divisional planes, and lias its enamel 

 minutely wrinkled. 



The crown of a tooth (Fig. 4) occupying a corresponding cavity of the 

 ninth pedestal, probably not fully produced in its length, in its present condi- 

 tion has a breadth exceeding the latter. The crown is a broad cone about 

 the length of the tooth first described, ])ut with double the width at base. 

 The exposed inner surface is defined in the usual manner from the outer, and 

 exhibits no divisional planes. The enamel is minutely wrinkled. 



The depth of the jaw-fragment below the visible base externally of the 

 first dental pedestal is. three-fourths of an inch ; the depth below the seventh 

 pedestal is 14^ lines. 



The s[)lenial bone -advanced as far as the back part of the sixth tooth. 

 Beyond it the Meckelian groove is deep and wide compared with that in C. 

 yropython, and extends to near the end of the jaw. 



Fig. 2 represents a posterior fragment of the opposite dentary bone, con- 

 taining the remains of a series of six teeth. The mutilated crowns of the 

 anterior two teeth retained in the specimen exhibit a swollen base, which 

 may also be seen to be the case in the crowns of the sixth and seventh teeth 

 of the anterior dentary fragment. 



From the two fragments of opposite dentary bones I am unable to ascer- 

 tain the number of teeth which belonged to the complete series, but it seems 

 to me that the seventh tooth of the anterior fragment about corresponds with 

 the first retained tooth of the posterior fragment, which would indicate a 

 series of twelve teeth. 



Fig. 10 represents an axis from the same individual as the preceding speci- 

 mens. It has the same form as that of C. i^yopijihon. The odontoid process, 

 and the elements of the atlas, all of which articulate suturally with the axis, 

 are detached from the specimen and do not accompany it. 



I'lie measurements of the axis are as follows : 



Lines. 



Length of body tbrough center, devoid of odoutoid process 18 



Breadth of axis between posterior ends of diapophyses , 28 



Widtli of posterior ball -. lOJ 



Height of posterior ball r ■ - • - r - 10 



Width of hypopopliysis 8 



Two mutilated dorsal vertebrae exhibit the zygosphenes and zygantra as 



