XIII. 



LIMB BONES. 



365 



cepting that the posterior edge of his specimen was imperfect, 

 while in these it is excurrent from the general outline of the distal 

 extremity, which in consequence has three excavated surfaces of 

 articulation. One of these is represented below. 



Diagram CLXIII. Humerus of Pleiosaurus trochanterius. Scale one-tenth of nature. 



Length, 18-0 inches; breadth of distal end, 9*7; depth, 3*4; 

 diameters of the head, 6-5 and 5-5 (or 5-8 and 4-8) ; of the shank 

 where smallest, 4-0 (or 3-6). From Foxcombe, Wheatley, &c. 



Diagram CLXIT. Femur of Pleiosaurus aequalis. n. s. Scale one-tenth of nature. 



Length, 23 inches; breadth of distal end, 8-5 ; depth there, 3-5 



