474 



E. C. Case — Dimetrodon incisivus. 



Art. XXXIII. — A Mounted Specimen of Dimetrodon incisivus 

 Cope, in the University of Michigan / by E. C. Case. 



In 1912 the author discovered the Brier Creek Bone Bed in 

 Archer County, Texas. This bone bed in the Wichita Forma- 

 tion of the Permo-Carboniferous deposits of northern Texas 

 contained, by far, more bones than any known accumulation of 

 the same age. Over 1500 specimens of separate bones were 

 recovered, and many times that number would have been taken 



Fig. 1. 



Fig. 1. Photograph of the mount of Dimetrodon incisivus Cope, x '055. 



had not a large proportion of the material been ruined by the 

 infiltration of iron-bearing waters which rotted the bones and 

 cemented them together in an inseparable mass. 



A complete description of this bed and of the new forms dis- 

 covered has been given by the author in Publication No. 207, 

 Carnegie Institution of Washington, 1915. Though most of 

 the bones were isolated, due to the complete maceration of the 

 bodies and the later movements of the material in the swamp 

 or muck-hole in which they were imbedded, some partially 

 complete skeletons were recovered, among them the nearly 

 complete skeleton of an Edaphosavrus crticiger Cope, which 

 has been partially cleaned and will be mounted in the Uni- 

 versity of Michigan next year. 



