CHAPTER VII. 



STKUCTUKE OF PHYLLONELLA SOLE^E, VAN BENEDEN AND HESSE, 

 A PAEASITE OF THE COMMON SOLE. 



ON the lower side of the sole are usually found specimens of a small parasitic flat 

 worm which lives on the surface "of the skin. This creature was first named and 

 described by two Belgian zoologists, Van Beneden and Hesse, who called it Phyllonella 

 solece. It is of flattened shape, the dorsal surface being slightly more convex than 



Fig. C. 



Fig. D. 



Fig. C. Egg of Pfiyllonella solece, seen under microscope in the fresh condition. Magnified 100 times. 

 Fig. D. Phyllonella solece, the ventral side uppermost, magnified 17 times; p.s., posterior sucker \ 

 a.g>, anterior glandular patches ; p., aperture of penis-sheath ; u., aperture of the uterua, 



