Permian of New Mexico. 391 



than the amphibia, the inner opening of the foramen or canal 

 hack of the border of the subscapular fossa which I have called 

 the glenoid foramen. That the canal perforates the bone to 

 open in the glenoid fossa I am not prepared to affirm. I find, 

 however, that the foramen is also present in the Diadectidse, 

 and perhaps in all cotylosaurians. Its presence removes the 

 last distinguishing character between the temnospondyl and 

 cotylosaurian pectoral girdles. One may distinguish them now 

 only by the smaller size of the cleithrnm in the reptiles. 



The suture separating the metacoracoid (coracoid auct.) is 

 situated not far back of the supracoracoid foramen, which is 

 unusually large. The limits of the coracoid (procoracoid auct.) 

 are not distinguishable ; the bone is thinned, rounded on the 

 anterior angle, which is slightly underlapped by the clavicle, 

 and, with the metacoracoid, is curved inward nearly to a hori- 

 zontal plane, approaching its mate of the opposite side, but 

 separated by the stem of the interclavicle. The interclavicle 

 reaches a little further back than the hind angle of the meta- 

 coracoid, and is of moderate width ; its front part is dilated and 

 mostly hidden from view, as in the other Permian reptiles. 



In each skeleton there is a pair of bones found lying just 

 back of the coracoids, and nearly below the vertebrae, of the 

 nature of which I am not fully satisfied, though there would 

 seem to be little doubt but that they are unusually large hyoids. 

 They are about three inches in length, greatly expanded on 

 their distal, thin end, with a somewhat curved and narrowed 

 shaft, deeply concave in outline on one side, less so on the 

 other, thickened and truncate for articulation at the proximal 

 end. The two bones in each specimen lie with the thin ends 

 nearly in apposition, as though they had joined each other in 

 life. 



Humerus. — The humerus is a remarkably short and thickset 

 bone, resembling that of Diadeetes more closely than that of 

 any other genus that I know. The ectocondyle is more ex- 

 panded and turned inward than in that genus, however, nor is 

 the proximal expansion so much twisted from the plane of the 

 entocondyle as is the case with the humeri of more terrestrial 

 Permian reptiles. The entocondylar foramen is large, situ- 

 ated not far from the lower extremity of the lateral process. 

 The ulnar expansion is broad and flat, and occupies a plane 

 divergent from that of the proximal inner side of about forty- 

 five degrees. The capitellum is very large and rounded, situ- 

 ated on the outer angle of the bone, as seen from the ventral 

 side, and is remarkably close to the lateral process. The 

 ectocondyle is remarkably stout and protuberant, and is directed 

 almost rectangularly, or even at an acute angle backward, termi- 

 nating very near the middle of the bone transversely, and above 



