Ill 



1921. Messrs. Rayner and Boyle presented it to the Laboratory, 

 and it lived in onr tanks until 9th May. During the whole of this 

 time it ate nothing. 



B. S. 



Echinus esvulentus, Linn. — Sea urchins were plentiful on the 

 local rocks during July of last 3 r ear. Some brought into the 

 Laboratory on the 19th yielded sperms later in the day, and on 

 the following morning fertilised eggs were found at the bottom 

 of the tanks. 



B. S. 



