ARTHUR E. SHIPLEY. 



EXPLANATION OF FIGURES. 



FIG. 1. Transverse section through the head of D. antardiciis, showing the edges of the suckers curling 



in round some foreign body, probably mucous tissue of the host. 

 2. Transverse section of D. antarctifus in the region of the neck, showing the regular arrangement 



of the longitudinal muscles ; ac., excretory canals ; .<., nerve cord. 

 ,, 3. Dibothrioceplialus srot/i, x '2. 



4. The head and sucker of D. scotti, X about 25, two views. 

 ,, 5. Surface view of D. scotti, X about 25, showing anteriorly the genital opening, g.p. ; the ova, oi'., 



scattered in the uterus, and the yolk-glands, y.glds. 

 6. Longitudinal section through two proglottides of D. seolti, showing median opening of uterus, 



o.ut., penis, j>., and opening of vagina, o.v. 



1. Section through epidermis and external parenchyma of D. scotti. 

 8. View of D. wilsoni, x 15. 



