186 KANSAS UNIVERSITY QUARTERLY. 



somewhat backward and upward with the bone in its former position. 

 Just how much of the conjoined bone is formed of each element it i» 

 imjjossible to say, since the union is so close that no trace of junction 

 is perceptible. Evidently, however, the coracoid forms only a small 

 part of the whole bone. Its anterior or inferior border is gently con- 

 vex, the posterior one slightly concave. 



The anterior end of the superior border of the scapula is gently 

 convex, as is also the broad external surface. On the inner side the 

 foramen described above opens into a deep, elongated, boat-shaped 

 cavity at its distal end, the cavity formed by the upper border of the 

 ridge described. In the lower or anterior end of the cavity there are 

 apparently two smaller foramina, the exterior orifices of which are 

 just within the anterior margin of the scapular face of the glenoid sur- 

 face. The proximal surface of the scapula is concave ; that of the 

 coracoid, if the bone is limited by the ridge spoken of, is for the most 

 part gently convex and lies in a more mesial plane. 



In comparison with the same bones of Dimetrodon, as figured and 

 described by Baur and Case (Trans. Amer. Phil. Soc, N. S., xx, p. 46, 

 pi. iii, fig. 30), the bone is much less concave along its lower border,, 

 more expanded proximally, the coracoid evidently smaller and not bi- 

 fid below, the glenoid surface smaller and broader, and the bone a little 

 larger. 



In plate xxx is shown the outside view of a part of the lower jaw 

 and two views of a skull bone of undetermined location. They will 

 be described more fully in a future communication. 



