igoS.J 



JENNINGS— HEREDITY IN PROTOZOA. 



403 



Fig. I. Outline of characteristic specimens from the original wild culture 

 I, April ID, 1907. The upper row shows examples of the larger " caiidatuin 

 form " ; the lower row examples of the smaller " aurclia form." d, Young 

 of the caudatum form; /;. dividing specimen of the aurclia form. All X 235. 



culture are shown in curve b (broken line). Diagrams i and 2; their 

 dimensions are given in the correlation Table II. It is evident that 

 this group corresponds in a general way with the smaller group of 

 the original culture, though its mean length and breadth are some- 

 wdiat lower (96.280 X 29.080 microns instead of 125.42 X 33-396), 

 and it shows a little less variation. 



2. Ten of the larger individuals selected from the original cul- 

 ture were likewise allowed to multiply in the same vessel for twelve 

 days, then 100 were measured. The results are shown in curve B, 

 Diagrams i and 2, and in the correlation Table III. It is evident 



