336 Mr. C. W. Andrews on the Development of 



bar carrying the articular surfaces for the coracoid and 

 humerus, an upwardly directed process, the blade, and a 

 broad ventral ramus, which extends forward and inwards to 

 the middle line, where it unites with its fellow of the opposite 

 side. 



Fig. 1. 



^^^ 



< I } y 





V 



Shouldor-giidle of Cryptoclidus oxoniensis (adult), from above. 

 About 4 nat. size, c, clavicle. 



The posterior bar is triangular in section. Its inner edge 

 forming the outer border of the coraco-scapular foramen is 

 sharp, thickening slightly as it approaches the coracoidal 

 surface ; the upper outer border is rounded and passes into 

 the posterior edge of the blade ; the lower outer border rises 

 into a rough ridge about 2 centim. from the glenoid surface, 

 and then runs forwards and inwards, forming on the outer 



