344 



GRACE MEDES 



c, d and e attain a greater size than those in a, with c largest, 

 b and d somewhat smaller and e about equal to a. The highest 

 points in the growth-curves of the larvae in b and c are reached 

 at 96 hours, coincident in time with that of a. Those in d do 

 not reach their maximum until 120 hours and in e until 144 



Figs. 23 to 26 Experiment 2. Sea-water diluted with distilled water. 



Fig. 23 2a, 120 hrs. Resorption of the skeleton has commenced. Anal 

 arms are affected more noticeably than oral. 



Fig. 24 2a, 168 hrs. Resorption more advanced. Anal arms almost dis- 

 appeared. Oral arms reduced. 



Fig. 25 2a, 168 hrs. Drawn from left side. Resorption still more advanced. 

 Anal and oral arms almost entirely disappeared. 



Fig. 26 2d, 96 hrs. Slight irregularities in the skeleton, and retarded fusing 

 of the lateral connective and body-rods. 



hours, indicating ultimate retarding of development. More- 

 over, in these more dilute solutions, the secondary readjustment 

 fails to occur and the specimens in g attain an ultimate size 

 only about one-half as great as those in a. Those in h under- 

 went cleavage but failed to form skeletons. 



