Independent Development of the Lens. 399 
CamerA Drawines or Livinc Funputus Empryos, Maeniriep 16 Times 
Fic. 1 An embryo eighteen days old. First thirty-six hours after fertiliza- 
tion were spent in7 per cent alcohol in sea-water. No optic cups formed, yet two 
perfect crystalline lenses are shown in the sides of the head. See fig. 5 for a sec- 
tion of these lenses. 
Fig. 2. Anembryo nineteen days old, first thirty-six hours in 9 per cent alcohol. 
Two perfect lenses near poorly formed eyelike choroid spots. See figs. 23 and 24 
for sections of these lenses and eye spots. 
Fic. 3 Anembryo of same age and lot as fig. 2; a free lens is seen in an extremely 
anterior position in front of anill-formed eye. Lens. L. 
Fra. 4 Another embryo of the same lot, showing a free lens between two some- 
what defective eyes, each of whichcontainsitsownlens. Sections of thisembryo, 
figs. 9 and 10, show also a second free lens which was hidden in the living specimen. 
