320 



THE STUDY OF ANIMAL LIFE CHAP. 



forms than as rep- 

 resentatives of an- 

 cestral crustaceans. 

 Moreover, if one in- 

 sists too much on 

 the approximate 

 parallelism between 

 the life-history of 

 the individual and 

 the progress of the 

 race, one is apt to 

 overlook the deeper 

 problem how it is 

 that the recapitula- 

 tion occurs to the 

 extent that it un- 

 doubtedly does. 



t/ 



The organism has 

 no feeling for his- 

 tory that it should 

 tread a sometimes 

 circuitous path, be- 

 cause its far-off an- 

 cestors did so. To 

 some extent we 

 may think of the in- 

 herited constitution 

 as if it were the 

 hand of the past 

 upon the organism, 

 compelling it to be- 

 come thus or thus, 

 but we must realise 

 that this is a living 

 not a dead hand ; 

 in other words, 

 these metamor- 

 phoses have their 

 efficient causes in 

 t h e actual con- 



FIG. 107. LIFE-HISTORY OF Penxus 

 A LATER STAGE. 



