GENERAL CHARACTERS. 



29 



Fio. 13.— Fasciola hepatica from the ventral surface ; x 4. 

 (After Sommer.) 



The alimentary and nervous systems only are shown on the left side 

 of the figure, the excretory system alone on the right side of the figure. 

 A, right main division of tlie alimentary canal. C, one of its diverticula. 

 CS, oin-us-sao. D, left anterior dorsal trunk of excretory system. G, lateral 

 ganglion, M, main trunk of excretory system. Hf, lateral nerve. O, mouth. 

 P, pharynx. S, ventral sucker. V, left anterior ventral trunk of excretory 

 system. X, excretory pore. 



