160 



REPTILIA. 



B. 



C. 



FIG. 102. 



DIAGRAM OF PECTORAL AKCH OF SAUROPTERYGIA, SHOWING GRADUAL ATKOPHY OF 

 CLAVICULAR ELEMENTS. 



A. Nothosaurus mirabilis ; dorsal aspect, about one-seventh nat. size. M. 



Triassic (Muschelkalk) ; Wiirtemberg. (After H. von Meyer.) 



B. Plesiosaurus ; ventral aspect (the dorsal aspect not yet seen), about 

 one-tenth nat. size. L. Jurassic (L. Lias); Lyme Kegis. (British Museum, 

 no. E. 1315.) 



C. D, E. Cryptoclidus oxoniensis; dorsal aspect of three successive stages of 



growth, about one-eleventh nat. size. U. Jurassic (Oxford Clay); Peter- 

 borough. (Leeds Collection, after C. W. Andrews.) 

 cl., clavicle; co., coracoid; i.cl., interclavicle ; sc., scapula. 



