EXPLANATION OF PLATE I. 



Fig. A Dorsal view of a cyclopean embryo in almost natural colors. The large antero-ventral eye 

 shows a slight furrow indicating its double nature. 



Fig. B The same embryo when the egg is rolled back towards the top of the page. A somewhat 

 ventral view showing the single pupil and lens, the double condition of the eye is only indicated from 

 above. 



