192 



Till-] GENESIS OF SPECIES. 



[ClIAI' 



In efts, as Prof. Gegenbaur liimsclf lias pointed out,"' 

 there is a striking- correspondence l^ctween tlie bones or 

 cartilages su])porting the arm, wrist, and lingers, and those 



A, 8KEL£T0N OF ANTERIOB KXTBEMITT OF AN EFT. 

 U. SKELETON OK POSTEUIOE EXTUEMITY OF TUE HAKE. 



sustaining the leg, ankle, and toes, with the exception 

 that the toes exceed the lingers in number by one. 



Yet these animals are far from beincr the root-forms from 



SKELETON OF A PLFiJIOSAUltrS. 



which all the Vertebrata have diverged, as is evidenced from 

 the degree of specialization which their structure presents. 



" In his work on the Carpus and Tarsus. 



