ZOOLOGY AND BOTANY, MICROSCOPi", ETC. 



145 



entire independence of the ovary. It may be, however, that testes and 

 seminal vesicle arise from a transformation of what is the receptaculnm 

 in ordinary female Copepods. Does epithelial tissue become in part 

 germinative, or does somatic tissue become testicular ? Further inquiry 

 is needed. J. A. T. 



Yolk-formation in Copepod Ovum. — H. Leighton Kesteven 

 {Proc. Linn. Soc, N.S.W., 1918, 43, 136-41, 1 pi.). In Ubius hiUi 

 Kestv., an endoparasitic Copepod from Ptychodera australiensis Hill, 



K 



^^ nn^pni^ 



Ubms hilli Kestv. 



Stage in formation of new nucleus. K, karyosomes ; Nu.", the new 

 nucleus nearly formed ; Nzi. memh.', the nuclear membrane of 

 the old nucleus ; Nu. memh.", the nuclear membrane of the new 

 nucleus. 



M' file o.^\o_ ,0 .'b „ .^ <, .% ? « / 





!»^o 



'''At'"' 

 ' 'A 



Sections of mature primary oocytes, with nucleus and yolk-granules. 



