93 



CHAPTER VTT. 



STRUCTURE OP PHYLLONELLA SOLE.E, VAN BENEDEN AND HESSE, 

 A PARASITE OP 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. C— Egg of Phyllonella solece, seen under microscope in the fresh condition. Magnified 100 times. 

 Yig. B.— Phyllonella solew,, the ventral side uppermost, magnified 17 times; p.s., posterior sucker; 

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



