260 Dr. Wyman on the Blind Fishes of the Mammoth Cave. 
ument ceased. 
According to Quatrefages, however, the eye of Amphioxus 1s - 
contained wholly in the cavity of the dura mater, and yet it has 
regard to its development, the anatomieal characters which sa 
been enumerated show, that though quite imperfect as we see " 
in the adult, it is constructed after the type of the eyes of othe 
vertebrates. It certainly is not adapted to the formation of wrt 
1c 
as representing the latter the increased number of pigment cells 
