890 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [172] 



PLATE XII. 



Rhynchobothrium ten uispine, sp. nov. 



Fig. 1. Proboscis, near apex, x about 900. 

 Fig. 2. Tumid base of proboscis, X about 900. 



Rhynchobothrium heterospine, sp e nov. 



Fig. 3. Head and neck, from alcoholic specimen, X 27. 



Fig. 4. Principal forms of booklets, highly magnified. 



Fig. 5. Portion of proboscis, X about 400. 



Fig. 6. Posterior segment, from alcoholic specimen, X4|; a, hilum left by separa- 

 tion of this from the preceding segment ; 6, the characteristic notch form- 

 ing the marginal genital aperture. 



Rhynchobothrium. imparispine, sp. nov. 



Fig. 7. Head and neck, from alcoholic specimen, X 15. 

 Fig. 8. Proboscis near middle, x about 200. 

 Fig. 9. Proboscis near apex, x about 200. 



Ehynchobothrium tvagtneri, sp. nov. 



Fig. 10. Strobile, outline from life, details of last segment filled in from alcoholic 



specimen, X 18. 

 Fig. 11. Base of proboscis, showing the arrangement and relative sizes of the basal 



hooks and the single large hook. The latter lies on the outer side of the 



proboscis as shown in Fig. 10, X about 400. 

 Fig. 12. Proboscis near apex, X about 400. 

 All the figures made by Margaret B. Linton. 





