THE CESTODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 453 
PEATE TI: 
Fig. 7. Entire specimen of Dibothriocephalus mobilis, n. sp. 
Fig. 8. Scolices of D. mobilis, n. sp. 
Fig. 9. Transverse section of proglottis of D. mobilis. 
elo 5 through uterus and cirrus sac of D. mobilis. 
11. Proglottis of Dibothriocephalus pygoscelis, n. sp. 
ig. 12. Diagrammatic longitudinal section of proglottides of D. pygoscelis, showing position of sex 
ngs and uterine coils, 
13. Metacestode of Phyllobothrium sp., from blubber of Weddell’s Seal. 
. 14, Scolex of Phyllobothrium sp. 
ig. 15. Larval Tetrarhynchus from the muscles of the Bonito. 
16. Transverse section of larval Tetrarhynchus through retractor muscles of proboscides. 
17. Diagram of posterior end of larval Z'etrarhynchus showing excretory bulb retracted. 
. 18. Transverse section of larval Tetrarhynchus through retracted bulb, showing row of excretory 
“TRANS. ROY. SOC. EDIN., VOL. XLVIII. PART II. (NO. 22). 68 
