S. Yokogawa 
153 
Text-fig. 5. Development of primordium of male reproductive system, a-c. First parasitic stage, 
24 hours after infection; d and e, first parasitic stage, 30 hours after infection, length 0-825 mm.; 
/, first parasitic stage, 45 hours after infection, length 0-05 mm.; g, first parasitic stage, 
35 hours after infection, length 1-13 mm.; h, first parasitic stage, 50 hours after infection, 
length 1-08 mm.; j, second stage, 40 hours after infection, length l-l mm.; k, second parasitic 
stage, 45 hours after infection, length 1 mm.; Z, second parasitic stage, 54 hours after infection, 
length 111 mm. ;m, second parasitic stage, 52 hours after infection, length 1 -45 nun.; n, second 
parasitic stage, 60 hours after infection, length 1-75 mm. 
