No. 383.] BASIS FOR A THEORY OF COLOR VISION. 837 
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Fic. 1. — Various E of yoimopHon, is isolated by gI p 
of retinal rods. h over each figure, the place where the 
section is taken being appre by the ser E 1, upright terminal rod from ocellus V 
of Acilius e Fig. 2); ontal terminal rod from sides of ocellus II of Acilius 
(cf. Fig. 3); — real cell » with short horizontal rod from ocellus II; 4, retinal 
cell with shell f Limulus; 5, retinula cell from compound eye 
be me 6, retinal cell from shoe ocelius of Lycosa; 7, retinula cell with serrated rod 
f Pin ; $, 
cll oom retina of @ bea “Amphibian pin of t Diemyctylus), showing two nuclei, n and ", 
e rod; ro, cone cell from same animal, showing Gauni nature of the cell as 
well as of the cone. The body corr 
