Bulletin of the Museum of Comparative Zoölogy 
AT HARVARD COLLEGE 
Vor. XXX. No. 6. 
PHOTOMECHANICAL CHANGES IN THE RETINAL PIGMENT 
CELLS OF PALZXMONETES, AND THEIR RELATION 
TO THE CENTRAL NERVOUS SYSTEM. 
Bv G. H. PARKER. 
Wıru ONE PLATE. 
CAMBRIDGE, MASS., U. S. A.: 
PRINTED FOR THE MUSEUM. 
APRIL, 1897. 
