HAPLOIDS 



147 



ter halves pass to the poles. A small cell cuts off from 

 a large one. The latter becomes the functional sperm. 

 It has the haploid number of chromosomes. 



The male of the rotifer, Hydatina senta, is a haplont 

 (Fig. 87c), and the females are diplonts. Under unfavor- 



Fig. 87. 

 A, parthenogenetic female of Hydatina senta; B, young female 

 of same; C, male of same; D, parthenogenetic egg; E, male-pro- 

 ducing egg; F, winter egg. (After Whitney.) 



