26 G-H Canadian Arctic Expedition, 1913-18 



PLATE II. 



Fig. 11. Divhyttobothfium canadcnse, ripe proglottis, surficial view, showing testes on the right 



and vitelline follicles on the left. 



Fig. 12. Proteocephalvs arcticus, ripe prcglottis, surficial view, testes not shown. 

 Fig. 13. Lateripvrus gepgraphicus, mature proglottis, surficial view, uterus and receptaculum 



seminis not yet developed. 

 Fig. 14. Lateriporus geographicus, mature proglottides, surficial views, showing three stages of 



the development of the uterus which is shaded. 

 Fig. 15. Choanotaenia passerellae, mature proglottis, surficial view, uterus not yet developed. 





