308 Genetics of a Daphnia Hybrid durhig Pai'thenogenesis 



Fig. 1. Males of Daphnia. (1) D. ohtusa ; (2) D. pulex ; (3) hybrid, 

 D. obtusa X D. pulex ; (4) dorsal abdominal processes of a hybrid 

 on a larger scale; A, B, C, the three dorsal abdominal processes ; 

 b — b', the line along which the measurements of process B were 

 made. 



