BIOLOGICAL BULLETIN, VOL. Lll. 



PLATE I. 



A 



March 14 



to 

 March 23. 



Oct. 6. 



Contracted 



Aboral Aspect. 



March 24 



to 

 March 29. 



March 30. March 31. April 8. 



Oct. 9. Oct. ii. Oct. 22. 

 Con- Con- Expand- 



tracted. tracted. ing. 



Oct. 30. 

 Dead. 



Oct. 23. 



Con- 

 tracting. 



Oct. 24. Oct. 26. 



Ex- Con- 



panded. tracted. 



.-- " > __ 



K - 



# 



A 



i 



I 





. ,; 

 



. , 

 











-.V, '',- 



-, - <- ;'. 



---b 



W. A. KEPNER AND W. N. JESTER. 



