RAIA. 



327 



possibly be homologous with the transverse processes and 

 ribs of the trunk-portion, respectively. 



2. Peripheral.— (i) The anterior or pectoral element 

 consists of a pectoral girdle and pectoral fin. The girdle is 

 a single piece of cartilage which has a ventral *'coracoid 

 bar " across the ventral middle line, and expanded lateral 



Fig. 233.— Dorsal View of Pectoral Girdle and Fin of the 

 Skate. {Ad 7iat.) 



Anterior Facet, 



Middle Facet 



Posterior Facet. 



portions. Each of these is pierced by three foramina and 

 bears three glenoid facets. Dorsal to these a portion, the 

 scapular cartilage, is bent towards the middle line and 

 attached to the vertebral column by ligament. Articulated 



