XIII. 



LIMB BONES. 



367 



CLXVI. is, like many others, of a depressed hour-glass form, cor- 

 responding to some equally depressed tarsal and cnemial bones, 



Diagram, CLXVI. Pleiosaurus macromerus. Scale one-fifth of nature. 

 i. Phalangal bone, seen from above. 2. The same, seen edgeways. 3. The 



terminal surface. 



and the large but not thick femora of the great pleiosaurus of 

 Swindon. 



Length, 3-5 inches; greatest breadth, q-6 -, smallest breadth, n ; 

 depth, i '7. 



Diagram CLX VII. Bib of Pleiosaurus, which appears to have been somewhat 

 cartilaginous toward the extremities. Scale one-tenth of nature. 



