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EXPLANATION OF PLATES. 



Fig. 1. Dorsal aspect of the larva, showing the entire nervous systeni. The 

 ventral longitudinal muscles have been represented on the right side to 

 illustrate their relation to the nerves. 



lA, 2A, 3.4, etc., abdominal segments. 



IT, 2T, ST. first, second and third thoracic segments. 



/, //, ///. first, second and third thoracic ganglia. 



1-S. first to eight abdominal ganglia. 



aim. alimentary canal. 



ant. antenna. 



d, d, d. outline of the ventral diaphragm. 



ej. d. ejaculatory duct. 



g, g. tracheal gills. 



in. n. intestinal nerve. 



//, //. lateral filaments of the abdominal segments. 



■m,, m^. upper-great-vent ral-recti-iBuscIes. 



mj. large bundle of muscles in the ninth abdominal segment. 



md. mandible. 



m.v. maxilla. 



N. neck. 



