XVlll 



The homologies of the elements of the girdle of Dipnoans with those 

 of other fishes, and the added elements in the latter will be as follows : — 



It will be thus seen that the determinations here adopted depend mainly 

 (1) on the interpretation of the homologies of the elements with which 

 the pectoral limbs are articulated, and (2) on the application of the term 

 "coracoid." The name "coracoid," originally applied to the process so 

 called in the human scapula, and subsequently extended to the independent 

 element homologous with it in birds and other vertebrates, has been more 

 especially retained (e. g., by Parker in Mammals, etc.) for the region in- 

 cluding the glenoid cavity. On the assumption that this may be preferred 

 by most zootomists, the preceding terms have been applied. But, if the 

 name should be restricted to the proximal element, nearest the glenoid 

 cavity, in which ossification commences, the name Paraglenal given by 



1 The name scapula might have been retained for this element as it is (if the views 

 here maintained are correct) homologous with the entire seapala of man, less the 

 coracoid and glenoid elements, but the restricted meaning has been bo universally 

 adopted that it would be inexpedient now to extend the word. 



