PLATE i 
A. —Otocephalic guinea pigs of grades io, 9, 7, and 4 in comparison with a normal 
(extreme right). Ventral view. 
B. —Lateral view of the otocephalic guinea pigs (grades 10, 9, 7, and 4, and the nor¬ 
mal) shown in A. 
(182) 
