NOGUCHI 



PLATE 30 



% 



«i 



/■}■-: 



fm^^^ 



„ .' 'ity ' ■ 'T'- • 



1 1 



1 to 4. Eggs of Arbacia punctulata. 1 , Normal. 2 to 4, Different stages of 



Ovolysis caused by I per cent Cobra venom in sea-water. 



5 to 8. Eggs of Lepidonatus squamatus. 5, Normal. 6 and 7, Different stages 



of Ovolysis caused by i per cent Cobra and 2 per cent Crotalus venom, 

 showmg no real Ovolysis, but peculiar Retraction of Deutoplasm. 



9 to II. Pluteus stage of Arbacia punctulata. 9, Normal, active pluteus. 10, Plu- 

 teus under the effect of 2 per cent Cobra venom. 1 I , Disinte^ation 



under the effect of same venom. 



(Drawings by Noguchi.) 



