Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. XL. No. 1. 



CHANGES ACCOMPANYING THE MIGRATION OF THE EYE 



AND OBSERVATIONS ON THE TRACTUS OPTICUS AND 



TECTUM OPTICUM IN PSEUDOPLEURONECTES 



AMERICANUS. 



By Stephen R. Williams. 



With Five Plates. 



CAMBRIDGE, MASS., U.S.A.: 



PRINTED FOR THE MUSEUM. 



Mat, 1902. 



