366 



GRACE MEDES 



TABLE 10 



Constants, Experiment 6. Solution d 



24 hours 



36 hours 



Right anal 

 Left anal. . 

 Right oral. 

 Left oral . . 



Right anal 

 Left anal. . 

 Right oral. 

 Left oral . 



6.20 

 6.20 

 6.04 

 6.04 



35.23 

 35.42 

 28.05 

 28.03 



0.27 

 0.27 

 27 

 0.27 



0.28 

 0.28 

 0.23 

 0.22 



STANDARD 

 DEVIATION 



4.00 

 4.00 

 4.07 

 4.07 



4.29 

 4.26 

 3.41 

 3.41 



0.19 

 0.19 

 0.19 

 0.19 



0.20 

 0.20 

 0.16 

 0.16 



COEFFICIENT OF 

 VARIATION 



64.67 

 64.67 

 67.41 

 67.41 



12.20 

 12.05 

 12.17 

 12.14 



4.18 

 4.18 

 4 41 

 4.41 



0.56 

 0.58 

 0.58 

 0.58 



Figs. 49 to 70. Experiment 6. XaOH, 

 Fig. 49 6a, 24 hrs. Control. 



Fig. 50 66, figures 51 and 52 6c, figures 53 and 54 6rf, 24 hrs. 

 in the solutions of greater alkalinity. 



Increased size 



50), however, most of the specimens are more advanced and 

 possess skeletons ranging from minute rounded centers which 

 can be detected only by their bright shiny appearance, to dis- 

 tinct tri-radiate spicules. In solution c (figs. 51 and 52) and d 

 (figs. 53 and 54), the tri-radiate character of the spicules is evi- 

 dent in nearly all, while in many of d the posterior rays have 

 begun to differentiate into body-rods. 



At the age of 36 hours, the individuals of culture a possessed 

 skeletons of approximately the same size as those of the other 



