330 Puget Sound Marine Sta. Pub. Vol. 1, No. 28 



PLATE 73 



c^=first cleavage plane 



c~=seeond cleavage plane 



c"^^=third cleavage plane 



cz'=cortical vacuoles 



(7d=germinal disk 



r7*=germinal substance 



oc=oil cup 



o^T^^oil globule 



i/:^yolk 



£rr=zona radiata 

 Fig. 1. Section thru entire ovarian egg. X 6.8. 



Fig. 2. Section thru entire 3-hour egg showing the germinal disk. 

 X 6.8. 



Fig. 3. Section thru 8-hour egg, 2-celled stage. X6.8. 

 Fig. 4. Surface view of 8-hour egg from above, 2-celled stage. X 6.8. 

 Fig. 5. Surface view of 10-hour egg from above, 4-celled stage. 

 X 6.8. 



Fig. 6. Surface view of 20-hour egg from above, 16-celled stage. 

 X 6.8. 



