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



PLATE 73 



c^=first cleavage plane 



c^^second cleavage plane 



c'^=third cleavage plane 



(7j;=cortical vacuoles 



r/<i^germinal disk 



<7*=^germinal substance 



oc^oil cup 



o<7=oil globule 



?/=yolk 



sr=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. 



