59.11.66:4.36 



CONTRIBUTIONS FROM THE BERMUDA BIOLOGICAL STATION 



FOR RESEARCH. 



No. 70. 



EVIDENCE OF ASSORTIVE MATING IN A NUDIBRANCH. 



BY W. J. CROZIER. 



FROM THE PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES, 



VOL. Ill, No. 8. 



CAMBRIDGE, MASS., U.S.A. 

 AUGUST, 1917. 



