PLATE 3 



EXPLANATION OF FIGURES 



9 Cross-section of the light-organ of a one-year-old larva. C, cuticula; 

 F, fat-sphere; i^, hypodermis; LL, large leucocyte; p, photogenic layer of light- 

 organ, R, reflector layer of light-organ; SL, small leucocyte; T, trachea. 



10 Cross-section of the larval light-organ, forty-eight hours after the emer- 

 gence of the adult insect. C, cuticula; F, fat-spheres; H, hypodermis; LL, large 

 leucocyte: M, muscle; P, photogenic layer of larval light-organ; R, reflector 

 layer of larval light-organ; SL, small leucocyte; T, trachea. 



11 Portion of a cross-section of the seventh abdominal segment of a larva, 

 taken about one week before pupation, to show the arrangement of the fat- 

 spheres and hypodermis. B, basement membrane; F, fat-sphere; FG, fat-globules 

 H, hypodermis; LL, large leucocyte; M, muscle; 0, oenocyte; PC, primary cuti- 

 cula; SC, secondary cuticula; SL, small leucocyte; T, trachea. 



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