320 Charles R. Stockard 



The extreme cyclopean condition 



Fig. 46 Cross-section of hatched embryo, small cyclopean eye located in anterior tip of head. The 

 nose is anterior to this section, p, pigment on "forehead'' of embryo. 



Fig. 47 Section of thirteen day embryo. Small cyclops eye with large lens, differentiated retina 

 and abnormal brain partly surrounding the eye; ol.p., nasal pit. 



Fig. 48 Section of thirteen day cyclops with eye far forward and out of median line beneath an 

 abnormal mass of the brain. 



Figs. 49, 50 and 51 Sections of a small anterior cyclopean eye with large lens projecting out of optic 

 cup. The first section Fig. 49, is most anterior, the great-circle of the spherical lens. Fig. 50, tip of 

 lens in the edge of optic cup, and Fig. 51, center of optic cup behind the lens. 



Figs. 52 and 53 Sections of thirty day embryo which seemed eyeless in life. Brain abnormal. 

 Fig. 52, the cyclopean eye is represented by a choroid vesicle, E. The more posterior section, Fig. 53, 

 shows a perfect lens L, in the usual lateral position, but no optic cup exists. A band of muscle m is 

 between the lens and brain. 



Figs. 54 and 55 Sections of two lenses L, one forward by the olfactory pit, ol.p., the other more pos- 

 terior and surrounded by brain tissue. No optic cup present in this nine day embryo. 



