MORPHOLOGICAL REVISION 



105 



the bone, as in Eryops, and ends in a prominence over the cotylus. Just 

 beneath this prominence, the bone is penetrated by a large foramen. Beneath 

 the prominence formed by the continuation of the inner edge lies the hume- 

 ral cotylus, but it is very different from that of related Amphibia. Below 



A B 



Fig. 3;. — Acheloma cumminsi. No. 4205 Am. Mus. X f. 



A. Dorsal view of vertebrae column without scapulae. 



B. Ventral view of same, scapulae in position. 



the prominence is the flat face of the coracoid portion, and near the anterior 

 edge is a shallow depression, slightly oval in outline. There is no well- 

 formed cotylus, and the head of the humerus can not be made to fit into 

 the shallow pit or in any other part of this region. 



