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Abbreviations. 



I., lens. 



c. p. c, corneal pigment cell. 



0. p. c, outer pigment cell. 

 6. m., basement inembrane. 



1. ret. n., lower retinular nucleus. 

 ch., chitin. 



/. h., facet boundary. 

 ret. gang, n., nucleus of retinular gang- 

 lion, 

 far. sh., brain sheath. 



int. d., intracellular duct. 



c. c, crystalline cone. 



rhb., rhabdome. 



ret., retinula. 



pgm., pigment. 



n., nucleus. 



h. c, hair cell. 



tr., trachea. 



n. /., nerve fibre. 



