645 



3948. The sacrum. 



It consists of four anchylosed vertebrae. The spines have partly coalesced at their base. 

 The intervertebral foramina are divided at their outlets by the coalescence of the diapophyses. 



3949. An anterior thoracic rib. 



It shows the distinct head and tubercle. 



3950. A middle thoracic rib. 



The tubercle is less distinct. 



3951. A posterior thoracic rib. 



The tubercle has subsided. 



3952. The right scapula. 



It shows a great extension of the inferior costa, by the coalescence of the coarsely ossified 

 suprascapula. The acromion is more rudimental than in the Phoca grtenlandica. The 

 coracoid tubercle is almost obsolete. 



3953. The left humerus. 



The inner condyle is perforated, and it repeats the characteristics of the same bone in the 

 Phoca grcenlandica. 



3954. The left radius. 



It is greatly expanded and deeply grooved at its distal half. 



3955. The left ulna. 



The olecranon is remarkably expanded and compressed. 



3956. The ossa innominata. 



A deep concavity of the outer surface of the short and broad ilium is worthy of notice. 



3957. The right femur. 



The lower periphery of the head is notched. 



