SUMMARY OF YOLK FORMATION 



149 



Brambell 



jj 



Ludford 



>> 



Gatenbv 



Hirschler 



Harvey 



55 



5> 



Gatenby and 



Nath. 

 Nath . 



1924 Helix 

 1924 Patellai 



1922 Limncea 

 1921 Patella 



1922 Saccocirrus . 



1918 Czona 



1927 Ciona 



1929 Carcinus 



1925 Lumbricus 

 1925 Lumbricus 



1925 Scorpions 



{Euscorpius, 

 Buthus and 

 Palamnceus). 



Fatty yolk from Golgi 

 bodies. 



Albuminous yolk from 

 mitochondria. 



Nucleolar extrusions pos- 

 sibly related to yolk. 



Fatty yolk from Golgi 

 bodies. 



Albuminous yolk from 

 nucleolus. 



Fatty yolk from Golgi 

 bodies. 



Albuminous yolk from 

 nucleolus. 



Lipoidal matter contri- 

 buted by Golgi bodies 

 to swollen yolky mito- 

 chondria. 



Albuminous matter from 

 Golgi bodies and lipoi- 

 dal matter from test-cells 

 compounded by the 

 mitochondria. 



Fatty yolk material from 

 nucleolus and cytoplasm. 



Albuminous yolk from 

 Golgi bodies. 



Yolk from cytoplasm. 



No yolk present. 



Fatty yolk from Golgi 

 bodies. 



Albuminous yolk (when 

 present) from nucleolus. 

 (When albuminous yolk 

 absent, no nucleolar ex- 

 trusions.) 



