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ABBREVIATIONS. 



I., lens. 



c. p. c., cornea! pigment cell. 

 o. p. c., outer pigment cell. 

 b. m., basement membrane. 

 /. ret. n., lower retinular nucleus. 

 ch., chitin. 



/. b., facet boundary. 

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

 lion. 

 br. 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. 



