244 Kansas Academy of Science. 



EXPLANATION OF PLATES. 



PLATE I. 

 Photograph of the specimen of Pelion lyelli Wyman. This form may be 

 a true ancestor of the modern frogs or it may be an aberrant member of the 

 Microsiuria. Times, IJ. 



PLATE IL 



Fig. 1. Micrerpeton caudatum Moodie ; a branchiosaurian from the Car- 

 boniferous of Illinois. 



Fig. 2. Isodectes copei Williston ; a true reptile from the Carboniferous 

 of Ohio. 



Fig. 3. Tuditanus minimus Moodie; a microsaurian from the Carbonif- 

 erous of Pennsylvania. 



Fig. 4. Ptyonius nummifer Cope ; one of the atypical members of the 

 Aistopoda which serve to connect the Aistopoda with the Microsauria. No 

 limbs are present in this form. Carboniferous of Ohio. 



Fig. 5, Tuditanus brevirostris Cope ; a microsaurian from the Carbonif- 

 erous of Ohio. 



PLATE IIL 



Amphihamus grandiceps Cope ; a true microsaurian from the Mazon 

 Creek beds of Illinois. The outline of the body is well exhibited. 



