Shoulder-girdle in Cretaceous Oniithosauria. 



4U 



of the pelvis, which no other fossil group of animals parallels. 

 I accordingly make a restoration of this structure of the 

 shoulder-girdle (fig. 2). 



Fin-. 2. 



W NAT. SIZE 



Restoration of the Shoulder-girdle iu Omithocheirus. 

 Posterior aspect. 



The only hypothetical element is the posterior transverse 

 expansion of the sternum, which is never preserved in Cam- 

 bridge-Greensand specimens. I have also completed the 

 transverse processes of the vertebra ; but no specimen shows 

 the form of the articulation for the rib or the length of 

 the process. In some species the coracoids may have been 

 relatively longer ; but I believe this form of shoulder- 

 girdle is substantially the same in all the Cretaceous group. 

 It will be interesting if a similar structure is found in the 

 American species. 



I have long been aware of a very close affinity between 

 these fossils from Cretaceous Rocks of England and 

 America. The publication by Professor Marsh (Am. Journ. 

 Sci., May 1884) of figures of the skull of Pteranodon made 

 that affinity more manifest. Sir Richard Owen figured in 

 the ' Palseontographical Monograph of Cretaceous Pterosauria,' 

 pi. iv. figs. 4, 5, a fragment described as part of the proximal 



