Plate XXVI. 



Epibdella Ishikawae; 



Fig. 1. The whole worm viewed from the ventral side ; from a specimen killed free. 

 The nervous system is shaded with parallel lines. 

 „ 2. Hooks of the posterior sucker, x 204 diam. 



„ 3. The genital organs, vitellarium exclusive, viewed from the dorsal side. 

 X 50 diam. 



Epibdella ovata. 



Fig. 4. The whole worm viewed from the ventral side ; from a specimen killed free. 



X 50 diam. 

 „ 5. Hooks of the posterior sucker, x 204 diam. 

 „ G. The genital organs, vitellarium exclusive, viewed from the dorsal side. 



X about 73 diam. x, an organ of problematic nature. 

 „ 7. Cross-section of the penis. x204 diam. The cavity of the penis lies 



above due. ej. 

 „ 8. Section through one of the organs of problematic nature shown in fig. 6, 



with some of the histological elements in its vicinity, x 204 diam. 



