174 



Heredity. 



difTer from each other in this respect. Tiie shape and 

 structure of the fir:;t antennae and of the abdomen may 



Fig. 3. Head of female specimen 

 of Brancfiippus Grubei, greatly 

 enlarged, a. first antennae, b. 

 second anteimae. 



Fig. 4. Head of the male of the 

 same species. 



Fio. 5. Head of male Branchippus 

 stagnalis. 



Fia. 6. Head of male Artemia 

 salina. 



also show considerable modification in the males of vari- 

 ous sjDecies of Branch iopods. 



