248 KANSAS UNIVERSITY SCIENCE BULLETIN. 



The element here figured as an ulna (plate LII, U) is doubt- 

 fully referred to the arm, since the bones were found disasso- 

 ciated. It may belong to the leg. Its form is specifically difl"er- 

 ent from that which Cope figured as the ulna of Eryops mega- 

 cephalus, although its form is, in general, the same. It does 

 not depart widely, in point of form, from that of the radius, 

 which we should expect to be the case in a generalized verte- 

 brate. It is smaller, somewhat shorter, and the groove on the 

 ventral ( ?) surface is lacking. The radius and ulna are both 

 peculiarly amphibian in the way they have weathered. The 

 ends have assumed the concave form so characteristic of the 

 Branchiosauria and the modern Amphibia, indicating a higher 

 development of the perichondrium than of the endochondrium. 



Measurements of the ulna : 



Actual length of specimen 80 mm. 



Estimated length of specimen 93 



Width of shaft at middle 22 



Width of upper end (estimated) 47 



Width of lower end (estimated) 40 



Associated with the limb bones there is a portion of a pha- 

 lange of the hand ( ?) of the specimen. There are no carpals 

 preserved. The element figured (plate LIII, figs. 4 and 5) is 

 probably a metacarpal. Its form is very closely similar to that 

 figured by Cope for the metacarpal element of Eryops mega- 

 cephalus. Its upper end is very broad, with recurving edges 

 and with rugosities for muscular attachment. Its form is 

 crescent shaped and concave. The shaft narrows abruptly 

 from the upper end to the middle and then widens for the lower 

 end, which is lost. 



Measurements of the metacarpal : 



Actual length of specimen 23 mm. 



Estimated length of bone 27 



Width of upper end 22 



Thickness of upper end v 8 



The following description of the coraco-scapula (plates 

 L, LI) is taken from Doctor Williston's paper. The descrip- 

 tion of the cleithrum is appended : 



"The bone is elongated, and nowhere very thick or massive. 

 The distal part of the scapula is much thinned and considerably 

 expanded; the immediate margin here, however, is wanting, 

 so that the precise outlines cannot be given. 



"The position of the two bones must have been very oblique, 

 as is evident from the position of the glenoid cavity. The pos- 



