36 



TRANSFORMATIONS OF INi^ECl S. 



THE ERMN AND SEPARATE OPTIC 



NERVES, AND OTHER NERVOUS 



STRUCTURES OF THE LARVA OF THE 



WATER DEETLE. 



THE ERAIN AND THE t-NITED OPTIC 



NERVES, AND OTHER NERVOUS 



STRUCTURES OF THE PERFECT 



%VATER liEETLE. 



