1921.] R. J. TiLYARD : Epioplilcbia laidLrivi. 107 



might very well have arisen, in its turn, from that remarkable 

 group of Protodonata of which Typits pcriiiianus, discovered by Dr. 

 Sellards in the Lower Permian of Kansas' was a representative. 



' Amer- Jouyn. Sci. (4) XX, pp. 249-258 1906. 



