12 EINAR LÖNNBERG, CAMBARIDS FROM FLORIDA. 



Florida. Tliey have thus probably become differentiated as 

 species in that couiitry and their existence can not therefore 

 extend farther back thau to about the Plioeene. For this 

 reason they can not be niuch older than the possible maxi- 

 mum age of Cambarus acherontis. 



The ancestors of this species may either have forced their 

 way from the exteriör month of the snbterranean water or, 

 which is more probal^le, accidentally fallen down when one or 

 another of the many sinkholes orig-inated. When they once 

 had come down, they had to adapt themselves to the new 

 life. But thns the mode in which Cambarus acherontis has 

 originated is somewhat diiferent from that of other blind 

 species which live in laVge open caves with easier entrance. 



