PLATE 20 



Fig. I. — Restoration of Cricotus hcteroclitas Cope. About one-sixth natural size of an average specimen; 

 other specimens were considerably larger. The picture gives perhaps rather too strong a suggestion of 

 the aquatic characters; the animal should be represented as living in a river, to be on the safe side. 



^'°- 2 -—Restoration of Eryops megacephalus Cope. About one-tenth natural size of an average specimen. 

 The tail is represented rather short in consonance with the author's ideas of the creatures. 



Fig. 3. — a. Restoration of Diadcctes phaseolinus Cope, about one-tenth natural size; b, anterior view of 



same animal. 



