Plate XXVII. 



Diagrams intended to show tlie homology of the genital ducts in the Trematodes 

 and the Cestodes. Homologous ducts are coloured alike. 

 Fig. 1. Mickocotyle; dorsal view. 



,, 2. Distomum; dorsal view. Based on the figures of Leuckart and 

 Ijima, 



„ 3. Dactylogyrus; dorsal view. 



„ 4. Amphilina; ventral view. Based on the figure and description of 

 M n t i c e 1 1 i . 



,, 5. Cakyoph YLLAEus; ventral view. After Monticelli. 



,, 6. Taenia; ventral view. After Leuckart. 



,, 7. BoTHRiocEPHALus; vcutral view. After Leuckart . 



