THE CESTODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 31 



Platb II. 



Fig. 7. Entire specimen of Dihothrioeephalus molnlia, n. sp. 



Fig. 8. Scolices of D. mobilig, n. sp. 



Fig. 9. Transverse section of proglottis of D. mohilis. 



Fig. 10. ,, „ tlirough uterus and cirrus sac of D. mobilia. 



Fig. 11. Proglottis of Dihotlmocephalus pygoscelis, n. sp. 



Fig. 12. Diagrammatic longitudinal section of proglottides of D. pi/goscelis, showing position of sex 

 openings and uterine coils. 



Fig. 13. Metacestode of Pliyllobothrium sp., from blubber of Weddell's Seal. 



Fig. 14. Scolex of Phyllohothrium sp. 



Fig. 15. Larval Tetrarhynchus from the muscles of the Bonito. 



Fig. 16. Transverse section of larval Tetrarhynchus through retractor muscles of proboscides. 



Fig. 17. Diagram of posterior end of larval Tetrarhynchus showing excretory bulb retracted. 



Fig. 18. Transverse section of larval Tetrarhynchus through retracted bulb, showing row of excretory 

 vessels. 



(KOY. SOC. EDIN. TKAN8., VOL. XLVHI., 453.) 



