250 KANSAS UNIVERSITY SCIENCE BULLETIN. 



The scapula is evidently that of the right side, the same as 

 the humerus described below. 



On the antero-superior corner of the scapula is a part of a 

 peculiar element — the cleithrum. Its occurrence in the genus 

 Eryops has been noted by Case in two species. In E. latus the 

 cleithrum takes a most peculiar form. The form assumed by 

 the element in the present species is impossible to determine, 

 since the greater part of it has weathered away. 



The cleithrum is, apparently, simply laid on the upper edge 

 of the scapula, the union being hardly a sutural one. In the 

 present specimen it is represented only by the lower part, but 

 it could not have had the immense expanse superiorly as Case 

 and Williston have figured for the cleithrum in Eryops latus 

 Case. It was probably quite slender, as it is in the dicynodont 

 reptiles. The cleithrum is a thin plate of bone with a ridge 

 running along the interior border. The edge of the scapula 

 is depressed to receive the element. 



The characters of the scapula which are at variance with the 

 scapulse of the known species are the narrowness of the shaft, 

 the location and size of the cleithrum, and the position of the 

 cotylus. 



In regard to the three foramina seen and described in the 

 scapula Williston has recently proposed the terms supra-, post- 

 and infra-glenoid or supra-coracoid to designate these open- 

 ings. The foramina occur in all known Temnospondylia, as 

 well as in the Cotylosauria (2) and in the Pelycosauria (2). 

 The writer has recently described a branchiosaurian from the 

 Pennsylvanian of Mazon Creek in which three foramina are 

 visible in the scapula. This was thought to be of interest in 

 connection with the Temnospondylia, but investigation showed 

 that in the temnospondyles the foramina are in no case to be 

 regarded as occurring strictly in the scapula, but rather as be- 

 longing to the coracoid which is united with the scapula. 



An interesting question of homologies, or it may be parallel 

 development, arises in comparing the present scapula-coracoid 

 with the clavicular apparatus of Portheus. 



Measurements of scapula-coracoid : 



Actual length of specimen 33 . 7 cm. 



Estimated length of element 36 



Width of upper end of scapula 15.5 



Thickness at upper end 3 mm. 



Width at middle of shaft 6.6 cm. 



Width across coracoid portion 17 



