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. Miceocotyle; dorsal view. 



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

 Ijima. 



„ 3. Dactylogykus; dorsal view. 



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

 Monticelli. 



„ 5. Cakyophyllaeus; ventral view. After Monticelli. 



„ 6. Taenia; ventral view. After Leuckart. 



„ 7. Botheiocephalus; ventral view. After Leuckart. 



