LARVAE OF ARBACIA PUNCTULATA 



365 



TABLE 9 

 Constants, Experimeiit 6. Solution c 



24 hours 



36 hours 



48 hours 



72 hours 



96 hours 



Right anal 

 Left anal. . 

 Right oral. 

 Left oral. . 



(Right anal 

 Left anal. . 

 Right oral. 

 Left oral. . 



Right anal 

 Left anal. . 

 Right oral. 

 Left oral. . 



Right anal 

 Left anal. . 

 Right oral. 

 Left oral. . 



Right anal 

 Left anal. . 

 Right oral. 

 Left oral . . 



3.21 

 3.21 

 3.37 

 3.37 



0.12 

 0.12 

 0.12 

 0.12 



35.15 ± 0.27 

 35.10 =t 0.26 

 23.98 ±.0.22 

 23.85 ± 0.22 



40.63 

 40.63 

 29.15 

 29.06 



0.28 

 0.28 

 0.25 

 0.25 



43.21 ± 0.29 



43.11 ± 0.25 



33.32 ± 0.23 



33.13 ± 0.22 



45.13 

 45.01 

 32.78 

 32.96 



0.30 

 0.30 

 0.25 

 25 



STANDARD 

 DEVIATIOX 



1.87 

 1.87 

 1.87 

 1.87 



0.08 

 0.08 

 0.08 

 0.08 



4.06 ± 0.19 



3.97 ± 0.18 



3.36 ± 0.16 



3.34 ± 0.15 



4.16 

 4.16 

 3.85 

 3.79 



4.32 

 4.22 

 3.55 

 3.33 



4.53 

 4.56 

 3.78 

 3.80 



0.19 

 0.19 

 0.18 

 0.18 



0.20 

 0.20 

 0.16 

 0.15 



0.21 

 0.21 

 0.18 

 0.18 



COEFFICIENT OF 

 VARIATION 



58.49 

 58.49 

 56.09 

 56.09 



3.62 

 3.62 

 3.41 

 3.41 



11.57 ± 0.55 



11.33 ± 0.54 



14.03 ± 0.68 



14.01 ± 0.68 



10.25 

 10.25 

 13.20 

 13.08 



9.99 



9.79 



10.67 



10.06 



10.05 

 10.14 

 11.55 

 11.53 



0.49 

 0.49 

 0.64 

 0.63 



0.48 

 0.47 

 0.51 

 0.48 



0.48 

 0.48 

 0.54 

 0.55 



Plot 9 



at 24 hours the measurements of the general average indicate 

 the presence of small tri -radiate spicules, whereas in this solu- 

 tion no skeletal structures have appeared. In solution b (fig. 



