THE OPALINID CILIATE INFUSORIANS, 



303 



It seems best, in view of varied evidence, to place the final 

 separation of Africa from tropical America in the middle Cre- 

 taceous (fig. 235) in agreement with Eigenmann (1909) and Schu- 

 chert (1915?), though Arldt shows late Cretaceous and early Ter- 



I 



^^:^-^-^^ Mil 



tiary connection between these continents. Again m connection with 

 Arldt's chart of the conditions in the early Tertiary (fig. 236) it must 

 be noted that Patagonia, shown by Arldt as distinct from both tropi- 

 cal America and Antarctica, has been united in our chart with Ant- 



