XI. 



CETEOSA URUSHUMERUS. 



273 



The left-hand figure represents a right humerus, seen on the 

 front (or, in the crocodile, lower) face, shewing the deltoid crest. 

 Below is the outline of the lower end, a' marking the corresponding 

 points. 



The right-hand figure is taken from a left humerus, seen on the 

 posterior (in crocodile, upper) face. Above is the outline of the 

 upper extremity, the letter a. marking a corresponding position. 



The dimensions are as follows: Extreme length, 51*5 inches; 

 extreme breadth, upper, 20 ; lower, 15 ; greatest depth, upper, 7-5 ; 

 lower, 7-0 ; diameters at the middle of the shank, 8-5 and 4-5. 



One example of a humerus of the young ceteosaurus has occurred, 

 and is represented in the Diagram below. 



Diagram CI. Left Humerus of the small Ceteosaurus, on a scale one-tenth 



of nature. 



i. Seen in front, shewing the deltoid crest. 2. Seen behind (above in 



crocodile). The distal extremity incomplete. 



The dimensions of this bone are as follows: Length, 2i'75 

 inches (if complete, probably 24); breadth of proximal end, 10 

 inches; of distal end (incomplete), 7 inches; diameters of shank, 

 taken where it is smallest, the cross section being oval, 4-35 and 3-5 

 inches. 



To complete our views of the humerus, the fine specimen pre- 

 sented by Earl Ducie may be represented below. It is some- 



T 



