1 



-Diagram of the life-cycle of the skate. Raji batis. or c 

 illustrating the union of the egfi and sperm. E. and S., t 

 nrifjin of the phorozoon or asexual generatiun, the Rerminal track' "from Z 

 U.K.Z., the latter being the primitive germ-cell. The divisions of the latter 

 in Scyllittm or Pritttinnis. giving \'2% primary fjei 

 IS in a potentially fem 

 ally the unfolding of . 

 y germ-cell, the 66th, is depicted as forming an embryo or gametozoon. 

 te the track of heredity from generation to generation through the morpho- 

 logical continuity of the germ-cells a diagram of oogenesis has been appended 

 the 96th germ-cell, one of spermatogenesis to the 32nd. In the former, t 

 formation o^ a male-egg and of a female-egg is shown, in the latter the two forms 

 ' a after the statements of Meves). i.e.. the hair-Uke or function 



1-like or functionless speri 



r John Beard: 



