Biological Survey — Erie-Niagara Watershed 



203 



Plate II 



Fig. 6. — Typical egg of bass tapeworm, Proteocephalus ambloplitis (Leidy) 



Fig. 7. — Egg recovered from Eucyclops agilis showing clipped ends of 

 outer hyaline membrane and escaping oncosphere 



Fig. 8. — Procercoid larva in anal segment of Cyclops vulgaris 



Fig. 9. — Procercoid larva shown in figure 8 enlarged 



Fig. 10. — Outline drawing of Cyclops vulgaris showing procercoid larvae 

 of P. ambloplitis in body cavity; 2nd day of experiment 



Fig. 11. — P. ambloplitis larva recovered from rock bass, A. rupestris after 

 feeding on infected copepods 



Fig. 12. — P. ambloplitis larvae recovered from upper intestine of small- 

 mouthed bass, M. dolomieu after eating sunfish, E. gibbosus 



Fig. 13. — Plerocercoid larva of P. ambloplitis from upper intestine of M, 

 dolomieu, 16 days after eating second intermediate hosts 



The lines in the figures have the following values: 0.02 mm. in Fig. 7; 

 0.2 mm. in figures 10 and 12; in all others 0.05 mm. 



