124 



PHYLUM TROCHELMINTHES 



in addition to difference in length of life, differences \n fecundity of 

 individuals, correlated with differences in the size of the partheno- 

 genetic eggs from which they were derived. Lynch and Smith 

 (1931) showed that in rotifers it is possible to produce and maintain 

 depression for a long period of time and that the depression becomes 



Fig. 52. Brachionus militaris. Dorsal views. A, female with attached par- 

 thenogenetic female eggs; 5, female with attached parthenogenetic male eggs; C, 

 female with attached fertilized eggs; D, male. (After Whitney, Jour. Exp. ZooL, 

 vol. 24, Oct. 1917.) 



