EXPLANATION OF PLATE XXX. 



Placocephalus superbus, n. sp. 



Fig. 15. — Dorsal aspect, natural size. 

 ,, 16. — Ventral aspect, g.o., genital opening; m., mouth, 

 ,, 17. — Enlarged dorsal view of the head. 



? Placocephalus superbus. (See appendices, pp. 461 and 462.) 



Fig. 18. — Enlarged dorsal view of the head of specimen No. 

 ZEV -^V— (see p. 461). 

 ,, 19. — Enlarged lateral view of anterior end. 

 ,, 20. — Enlarged view of ventral side of the anterior end. 



, , 20a. — Enlarged dorsal view of head of specimen No. ZEV ^V-^ 

 (see p. 462). 



Pelmatoplana aurantia, n. sp. 



Fig. 21. — The entire animal, natural size. g. 0., genital opening; 

 m., mouth. 



,, 22. ^Enlarged dorsal view of the head, e.y eyes. 



,. 23. — Enlarged ventral view of the head. 



,, 24. — Enlarged lateral view of the head, e., eyes. 



,, 25.- Enlarged view showing markings on the mid-dorsal sur- 

 face. 



,, 26. — Enlarged view of the extreme posterior end of the body. 



Cotyloplana pilleata, n. sp. 



Fig. 27. — Dorsal view, natural size. The positions of the mouth 

 and genital opening are shown by the expansions of 

 the mid-dorsal line. 



,, 28. — Enlarged ventral view of the head, showing the sucker. 



,, 29. — Sketch to show the raised anterior end. 



,, 30. — Enlarged antero-lateral view of anterior end showing 

 the sucker. 



,, 31. — Ventral surface in the region of the genital opening. 



