530 



H. S. Jennings and George T. Hargitt. 



in all the races examined, L^, D, 21, Jf.3, of the caudatum races, 

 and k, C2, c and i among the aureha races. This characteristic 

 is not marked nor easily detected in any case. Since the posterior 



/ 



Fig. 22. Form and size of races k and i (both aurelia) under conditions of exces- 

 sive nutriment. The culture is the same as that of fig. 21, but after four days in 

 the bread infusion. Edinger drawing apparatus; X 375. 



tip is in the caudatum races more often sharply pointed than in 

 the aurelia races, its bundle of cilia more often stands out clearly 



