Manchester Memoirs, Vol. Iv. (191 1), No. 16. 



The two coracoids meet in a long median symphysis, 

 but separate from one another both anteriorly and 

 posteriorly, leaving triangular areas, no doubt occupied 

 by cartilage in life. 



The measurements of the right coracoid are : — 



Total length ,. 



Maximum breadth 



Width of bone at posterior end 

 Length of preglenoid extension 

 Facet for glenoid cavity 

 „ (scapula) 



20*3 cm. 

 iO"8 cm. 



5-5 cm. 



55 cm. 



4 cm. 



Fig. 2. The central and posterior part of the clavicular 

 arch, X I to shew the relation of the interclavicular 

 spine to the clavicules and interclavicular foramina. 



The upper figure shews the section exposed on the fracture 

 which terminates the spine, in natural position. 



The bone is remarkable for the breadth and flattened 

 form of the preglenoid extremity and its rather obscure 

 demarcation from the articular facette for the scapula. 

 The bone has the usual thickening between the glenoid 

 cavity and the middle line. One striking character, which 

 it .shares with the majority of lower liassic plesiosaurs, 



