52 
POrULAR SCIENCE REVIEW. 
associations between the mother and the young in the Southern 
Echinoderms, and as the subject is one of considerable interest 
and importance we have thought that a summary of his results 
might not be wholly unacceptable to our readers. 
Cladodactyla crocea, Lesson. (Natural size).* 
* We are indebted to the kindness of the President and Council of the Linnean 
Society for the use of this and the other illustrations to this article. 
