THE UPPER TRIASSIC OF WESTERN TEXAS. 



75 



There is a single left scapula (No. 7472, University of Michigan), in a somewhat 

 imperfect condition, the proximal end being slightly injured by decay. It is impossible 

 to give the exact outline of the anterior edge (see fig. 29 a), but there was evidently a much 

 greater extension of the region than in Rhytiodon carolinensis. The wide extension of 

 the anterior lower border recalls that of the Permian Pelycosauria and some of the 

 South African Upper Paleozoic reptiles. The articular face for the coracoid is thick and 

 heavy. The distal end of the blade was broken and the parts somewhat overthrust, 

 but making allowance for this the total length was 277 mm., slightly larger than R. 

 carolinensis. 



Via. 29. 



A. Right scapula. No. 7472, l". of Mich. X 0.15. 



B. Right femur. No. 3305, U. of -Mich. X 0.15. 



C. Right humerus, Xo. 7312, IT. of Mich. X 0.15. 



D. Right radius, No. 7312, U. of Mich. X 0.15. 



E. Right ulna, No. 7312, U. of Mich. X 0. 1 .",. 



A single right coracoid (No. 7315, University of Michigan) is too imperfect for 

 figuring or description, but shows the presence of a large notch on the anterior edge. 



A very imperfect scapula-coracoid (No. 7471, University of Michigan) shows only 

 the proximal portions and the outlines of the cotylus. Evidently there was in this 

 specimen the same large expansion of the anterior lower portion of the scapula as in 

 Xo. 7472, but the size of the preserved portions indicates an animal at least one-half 

 larger. 



