Yol. 51.] FROM RUSSIA AND SOUTH AFRICA. 351 



dealt with correlation depended in a great measure on the correctness 

 of the Author's identification with the Zechstein of the Russian fresh- 

 water beds alluded to. It would have been better, perhaps, to have 

 omitted the evidence afforded by the vertebrata, seeing that Russian 

 geologists were not in accord as to the precise age of the deposits in 

 which these occurred. The excellent work done by Prof . Amalitsky 

 with reference to the genera Palceomutela and Palceanodonta, and the 

 successful manner in which he had shown that Russian freshwater 

 lamellibranchiata were represented, almost specifically, in the Karoo 

 Beds of Africa, were points for congratulation. It migbt be 

 remarked, however, that the Author's views as to what constituted 

 a species in the Anthracosidse and their allies were rather broad — a 

 circumstance which might have assisted him in recognizing a closer 

 relationship between the European and African mollusca alluded to 

 than would otherwise have been the case. The Author had been 

 extremely careful in drawing up the generic synonymy of certain 

 forms described by Sir J. W. Dawson, and this paper would set at 

 rest many hitherto doubtful matters in that connexion. Altogether, 

 it was a very valuable and important communication. 



Q.J.G.S. No. 203. 2 c 



