PLATE 1 



EXPLANATION OF FIGURES 



All figures on this plate were photographed at a magnificatioii of 1000. They 

 have been reduced one-half in reproduction. 



1 A light eye of a 45 mm. larva showing the typical light or contracted con- 

 dition of the cone myoid. The pigment, however, is in the retracted or dark 

 position. 



2 A dark eye of a 42 mm. larva, showing the typical dark or extended condi- 

 tion of the cone myoids. The pigment, is again, however, not typical but shows 

 the forward or light position. 



3 A light eye of a 39 mm. larva showing the typical condition of both cones 

 and pigment. 



4 A dark eye of a 41 mm. larva showing the typical condition of both cones 

 and pigment. 



5 A transplanted light eye of a 43 mm. larva showing the typical light con- 

 dition of contracted myoids and forward pigment. 



6 A transplanted dark eye of a 41 mm. larva showing the typical dark condi- 

 tion of extended cone myoids and retracted pigment. 



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