U. S. B. F. — Doc. 959 



Fig. 6.— Cross section of skin and external muscles of small catfish, showing the parasite Ivins 



beneath the epithehum. A, epithelial layer; B, outer cell wall of para.site; C, nucleus of 



parasite. Hijjlily magnified. 

 ^^S- 7.— Portion of the gill of a biiffaloflsh, showing large parasite within the epithelium. 



Symbols the same as in fig. 6. Highly magnified. 

 Fig. S.— Section through a iiortion of the gill filament, showing embedded parasite. Symbols 



same as m fig. C. Highly magnified, 

 ^'p- 9;— Several parasites after removal from a fish, viewed by reflected light. Magnified 



30 diameters. o o 



(Material for photographs in figs. C, 7, and 8 was furnished by Dr. II. S. Davis.) 



