Life Cycle of Hydatina Senta 



TABLE III— continued 



323 



Well-fed 



NO. OF 

 GENERA- 

 TION 



34- 

 35- 

 36 



37- 

 38- 

 39- 

 40. 



41- 

 42. 



43- 

 44- 

 45- 

 46. 



47- 

 48. 



49- 

 5°- 

 51- 



5^- 

 53- 

 54- 

 55- 



Oct. 



DATE OF 

 FIRST 

 YOUNG 



c?9 



Sept. 



9$ 



o* 

 o* 



Total 



553 



33 

 42 



h\ 



^3/ 

 26 



50 



15 



2 



34 

 3^ 

 12 



31 



35 

 48 



4 

 17 

 27 

 34 



PER CENT 

 OFC?$ 



1652 



27.6 



26.2 



62.5 



37- 



47.2 



1-5 



21 .9 



25.0 



Starved 



NO. OF 

 GENERA- 

 TION 



39 

 40 



41 

 42 



43 

 44 

 45 

 46 



47 

 48 



49 

 50 

 51 



5^ 

 53 

 54 



Sept. 



Oct. 



DATE OF 

 FIRST 

 YOUNG 



&9 



o* 

 o* 



99 



466 



I* 

 I* 

 6 

 12 

 26 I 



'7/ 

 6 



27 

 9 



15 



13 J 

 24 



^5 

 19 



PER CENT 



OF cJ'9 



41- 



32.8 



35-3 



39-'' 



28. c 



40.2 



810 



36.5 



♦Remainder of family not recorded. 



continued throughout hfe, and was not concentrated in the first 

 few hours after hatching. The results are shown in Table III. 



There is a decidedlygreater proportion of male-producers among 

 the starved generations than among the well-fed. Since there is 

 considerable fluctuation in the well-fed line, covering long periods, 

 it is instructive to divide the experiment into parts, as shown in 

 Table IV. 



Had the experiment ended with the family started on July 27, 

 or had it included only the period from August 26 to September 

 5, or from September 21 to October 12, there would have been 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 8, NO. 3. 



