138 



THE OSTEOLOGY OF THE REPTILES 



the whole under side of the pectoral region, meeting in a firm median 

 symphysis; in most plesiosaurs throughout their lengths, but in the 



Fig. 109. Pectoral girdles: A, Nyctosaurus (Pterosauria). One 

 half natural size. B, C, Testudo (Chelonia). One half natural 

 size. D, Stegochelys (Chelonia). After Jaekel. One fourth 

 natural size. 



Elasmosauridae broadly separated posteriorly by a deep emargina- 

 tion, apparently a specialization (Fig. no). 



In most reptiles the single coracoid is fused with the scapula in 



