182 



Annals of the Carnegie Museum. 



the glenoid border terminates in an enlarged tuberosity, indicating a 

 heavy attachment for the cartilaginous prolongation of the scapula, 

 which was probably larger. The coracoid border is thin and one third 

 of its middle portion is curved inwardly. This internally directed 

 area of the coracoid border and the ridge for the tendinous insertion 

 near the glenoid border are the only eminences on the otherwise flat 

 subscapular face. Some 20 mm. above the head there is a distinct and 

 widely open groove extending obliquely across the subscapular neck 



Fig. 27. Anterior and posterior views of liumerus of Promerycochcerus carrikeri. 

 No. 1047; 5 nat. size, i, anterior; 2, posterior. 



which perhaps is due to the unusually close contact of the scapula with 

 the ribs in this region. In Merycoidodon there is also a faint trace of a 

 similar groove. 



That the clavicle persisted in P. carrikeri is highly probable, inas- 

 much as Merycoidodon culbertsoni (No. 1391), v/ith no greater developed 

 spine and acromion process, has a clavicle of considerable size, which 



