392 



Ralph S. Lillie 



TABLE II 



August 8, igo6. Eggs were removed from the animal at I0:I5 a.m., and treated as follows: Tempera- 

 ture of sea-water in the dishes, 2^° 



Interval after 

 removal from 



animal 

 minutes (ca.) 



Temperature and 

 time of exposure 



24 



^7 

 29 



29-5 



30 



31 



3^ 



36 



37 



38 

 39 



40 



41 

 41 



42 

 43 



50 



37 40 



38 5 

 38 10 



38 15 



38 20 



No membranes formed. No cleavage 



Ca. 50 per cent form membranes; many cleavages, mostly 

 irregular; no blastulae obtained 



All form membranes; numerous regular cleavages; a few 

 blastulae obtained 



All form membranes. Cleavage largely regular; blast- 

 ulae more numerous than in Experiment 3 



All form membranes. Cleavage more regular and rapid 

 than in Experiment 4; good proportion gastrulae 



Similar to 5; good proportion blastulae and gastrulae 



Practically no membranes (one seen). No cleavage 



All form membranes. Mostly irregular cleavage. No larvae 



Similar to 8 



More favorable; large proportion regular cleavages and a 

 fair number of blastulae and gastrulae 



Somewhat more favorable than 10; a considerable number 

 of blastulae and gastrulae 



A few membranes formed; no cleavage found 



Most form membranes: cleavage mostly irregular; no 

 blastulae obtained 



All form membranes; mostly irregular cleavages, a few 

 regular; no larvae found 



More favorable than 14; good proportion regular cleavages; 

 large number blastulae and gastrulae obtained, and a few 

 good Bipinnariae 



Fewer regular cleavages than in 15; a fair number of larvae 

 obtained 



Hardly any membranes (2 or 3 seen). No cleavages found 



Almost all form membranes. Cleavage irregular or incom- 

 plete. No larvae 



All form membranes and cleavage is less irregular than in 

 18. Some regular cleavages, and a few blastulae and 

 gastrulae obtained 



Large proportion of irregular cleavages and a fair propor- 

 tion give swimming blastulae and gastrulae; a few reach 

 Bipinnaria stage 



