Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXVI. No. 24. — April, 1901. 



CONTRIBUTIONS FROM THE ZOO LOGICAL LABORATORY OF THE 

 MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE. 

 E. L. MARK, DIRECTOR. — No. 119. 



A STUDY OF VARIATION IN THE FIDDLER CRAB 

 GELASIMUS PU GIL AT OR Latr. 



By Robert M. Yerkes. 



