312 Charles R. Stockard 



Transverse sections of di^erent degrees of double cyclopean eyes 



Fig. 35 Section of eyes in four day embryo, the two eyes united. Choroid coat beginning. 



Fig. 36 Section of "hour-glass" eyes, the optic nerve of the right component entering the normally 

 bilateral brain. From a sixteen day embryo, the retinae and lenses differentiated, r.o.n., right optic 

 nerve; Ch., choroid coat. 



Fig. 37 Section of eye in hatched embryo. Double-eye with two pupils and two lenses. Retina 

 undifferentiated. 



Fig. 38 Hatched cyclops, section through the peculiar eye with two components facing and lens 

 between them (see text). 



Fig. 39 Section through almost single cyclopean eye, only indication of its compound nature 

 paired retinal arrangement. Brain normal. 



Guide figure X indicates the plane of all sections and the eye position in the several specimens. 



