ADDITIONAL NOTE ON HELICINA OCCULTA 237 



plasticity and adaptability than that which is displayed by almost 

 any other terrestrial species. It therefore, supports, better than any 

 other single species, the conclusion that in time past the conditions 

 under which this and other loess species existed were essentially like 

 those under which this species lives today-especially those which 

 pertain to climate and vegetation-and that, therefore, during the 

 deposition of the fossiliferous loess the climate was not glacial. 



