438 Mr. J. W. Kirkby on Permian Entomostraca. 



The present species is merely placed in Leperditia as an approxi- 

 mation to its true position, and not because I think it ought to 

 remain there, though probably this genus and Beyrichia will 

 prove very close neighbours to it. 



Besides the species under notice, Mr. Jones has described an- 

 other from Byers' Quarry — L. ? glypta. In Germany, another 

 has been described by Dr. Reuss under the name of Cythere 

 Roessleri ; and Count Keyserling has noticed three more from 

 the Permians of Russia, terming them Cythere Schrenkii, C. 

 stricta, and C. grapta. 



The following Table gives a general view of the Permian 

 Entomostraca, with their distribution in England, Germany, and 

 Russia : — 



