198 



E. C. CASE 



distad to the cotylus in all the scapulae there is a triangular space 

 into which opens the second of the two foramina; this portion of 

 the bone is thickened and its edge is rounded. In Eryops this 



triangular space is marked 

 by a deep pit and the 

 foramen pierces the bot- 

 tom of it. In the scapula 

 under description the 

 space is flat and the fora- 

 men enters at the apex 

 of the triangle, which 

 is toward the distal end 

 of the bone. The space 

 is marked with a V-shaped 

 rugose line near its ante- 

 rior end ; no such line 

 occurs in Eryops. 



- .257" 

 .igo 



- .066 



Fig. 4. — Scapula, coracoid, and epicoracoid 

 of Enibolophorus dollovianus. With clavicle in 

 position. Right side. 



Length of scapula No. 186 

 Width at cotylus for humerus - 

 Width of distal end 



The third of the scapulae, No. 76, while distinctly amphibian, 

 presents many reptilian characters. As shown in Fig. 4, it has 

 a distinct cleithrum firmly attached to the distal end of the 

 scapula, and there is no evidence of a bony 

 coracoid ; on the other hand there is no evi- 

 dence of cartilaginous attachment on the 

 coracoidal and epicoracoidal edges. The 

 anterior foramen is located in a pit on the 

 anterior edge of the upper extremity of 

 the cotylus, and in this respect is much 

 more similar to the reptiles than to the 

 amphibians. The triangular space distad 

 to the cotylus is filled and marked by a Fig. s.-Dorsal spine 



,7. , , . . , -r^. , . , of Zatrachys criicifer. 



V-shaped rugosity, as m the Diadectid p^ ni behind 

 scapula. 



In Dimetrodon and Embolophonis the anterior foramen opens 

 close to the strongly projecting upper edge of the cotylus ; 



