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



PLATE 74 

 6d^blastoderm 

 c^=first cleavage plane 

 r/«?=germinal disk 

 Fig. 7. Surface view of 23-hour egg from above, 32-celled stage. 

 X 7.6. 



Fig. 8. Surface view of 23-hour egg from above, 32-celled, dumb- 

 bell shaped. X 7.6. 



Fig. 9. Surface view of 26-hour egg from above, 64-celled. X 7.6. 

 Fig. 10. Surface view of 32-hour egg from above, approximately 

 128-celled. X 7.6. 



Fig. 11. Surface view of 44-hour egg from above, many celled. 

 X 7.6. 



Fig. 12. Surface view of 101 -hour egg from above, showing blasto- 

 disk. X 7.6. 



