24 G-H Canadian Arctic Expedition, 1913-18 



PLATE I. 



Fig. 1. Epibdella hippoglossi, hooks of posterior sucker, surficial view. 



Fig. 2. Epibdella hippoglossi, same, lateral view. 



Fig. 3. Orthosplanchnus arcticus, ovary and central connections of the female reproductive 



ducts. The line represents 0-2 mm. 



Fig. 4. Diphyllobothrium canadense, scolex, surficial view. 



Fig. 5. Diphyllobothrium canadense, same, lateral view. 



Fig. 6. Diphyllobothrium sp. larv. from Salvelinus marstoni, scolex, surficial view. 



Fig. 7. Diphyllobothrium sp. larv., same, lateral view. 



Fig. 8. Proteocephalus arcticus, scolex surficial view. The line represents 0-2 mm. 



Fig. 9. Lateriporus geographicus, scolex, surficial view. 



Fig. 10. Choanotaenia passerellae, scolex, surficial view. The line represents 0-2 mm. 



