Bulletin of the Museum of Comparative Zoology 
AT HARVARD COLLEGE. 
Vou.) 20,. No.) 1. 
CHANGES ACCOMPANYING THE MIGRATION OF THE EYE 
AND OBSERVATIONS ON THE TRACTUS OPTICUS AND 
TECTUM OPTICUM IN PSEUDOPLEURONECTES 
AMERICANUS. 
By STerPHEN R. WILLIAMS. 
WirnH Five PuAtTsEs. 
CAMBRIDGE, MASS., U.S. A.: 
PRINTED FOR THE MUSEUM. 
May, 1902. 
