42 



C. SASAKI. 



Fig. 12. Diagrammatic figure of the respiratory system of Ugimya. a a', 

 h h', c c'. Air sacs in the head, d <1'. Those in the proboscis. 

 ee',ff.' Those in the thorax, g g'. Those in the abdomen. 



Fig. 13. Nervous system of Ugimya. o(/. Optic ganglion, sr/. Supra- 

 œsophageal ganghon. ?'^. Infra-œsophageal ganghon. tg, 

 tg'. Two thoracic ganglia. cm. Nerve commissures in the 

 abdomen, ed. Optic disc. 



PLATE III. 



Fig. 1. Ideal section of silkworm showing its internal organs in 

 which the mao-o;ot lodo-es. a. Digestive canal, h. Silkgland. 

 c. Nervous system. d. Ganglion containing a maggot. e. 

 Trachea. /. Tracheal chamber just beneath the stigma, into 

 which maggot makes its way. g. Empty ganglion which 

 maggot has left. h. Tracheal chamber with a maggot. 

 i. Maggots hatched out in the digestive canal, j. Empty egg- 

 shell. Ji. Chorion. 



Fig. 2. Empty egg-shell of Ugimya with a fracture on its flattened 

 side. ^. 



Fig. 2 A. Maggot leaving chorion, f. 



i^/^. 5j4,5. Diseased silkworms having maggots in their ganglia. \. 



Fig. 6. Ganglion-cells of silkworm. ^. 



Fig. 7. Nervous system bearing five ganglia (c^, />, c, J, r.) infested 

 by maggots. \. 



Fig. 8. Maggots entering a ganglion. ~. 



Fig. 9, Ganglion containing a maggot. ^. 



Fig. 10. Cup-like chamber on tlie tracliea of silkworm containing a 

 maggot, -y . 



Fig. 11. Inside view of a cup-like chamber from whicli the maggot 

 has been removed. -',". 



