350 julian mast wolfsohn. 



Conclusions. 



i. As in the case of Lottia so also in that of Acmcea patina, 

 pelta, persona and scabra, the addition of a small quantity of al- 

 kali to the sea water will cause the eggs to become mature. 



2. The presence of oxygen hastens the destruction of the 

 mature unfertilized eggs of Acmcea. 



3. Lack of oxygen or the inhibition of the oxidative processes 

 in the egg by the addition of a little potassium cyanide to the 

 sea water not only prevents maturation but prevents also the dis- 

 integration of the mature unfertilized egg. 



4. The treatment of the immature eggs of Acmcea with fat 

 solvents, such as benzol, chloroform, ether, and ethyl acetate 

 will also cause them to become mature. 



