518 University of California Puhlications in Zoology ["^ol. 18 



of the glandular structures of the anterior end and the germ cells near 

 the posterior end. 



The cephalic glands in the miracidium of Schistosoma japonicum 

 are smaller in proportion to the length of the body than in S. mansoni 

 (cf. fig. 2, eg; 4:, eg). Also fewer germ balls are present in the posterior 

 body region than in the miracidium of S. mansoni. The figures of 

 both miracidia represent optical sections and therefore cannot show 

 the total number of germ cells or their exact relation. 



The excretory system of Schistosoma japonicum is shown in figures 

 6 and 7. Excretory pores are located near the posterior end on each 

 side (figs. 6, 7, exp) . The two sides of the system are entirely separate. 

 From the pores on each side the main tubules coil backward and then 

 forward and again back to the points on each side where they receive 

 the capillaries from the flame cells (figs. 6, 7, /) . The capillaries of the 

 flame cells are of distinctly smaller caliber than the main tubules. 

 The positions of the flame cells' are shown in figure 6. 



Looss's descriptions and figures (1893, p. 189) of the excretory 

 system of the miracidium of Schistosoma haemotohium differ in two 

 particulars from the above description of this system in S. japonicum. 

 Looss showed all the tubules of the same caliber. He also figured the 

 capillaries of the posterior flame cells as much shorter than those of 

 the anterior flame cells. 



