Bull. U. S. F. C. 1899. (To face page 492.) 
Plate I. 
1. Transverse section of dorsal region of young herring ( Clupea I 3. IsolatecPsporozoa, different views and enlargements, hie. 
harengus) with cysts containing sporozoa. x 32. m, Muscular [ 4. Piece of intestine of Pseudopleuronectes ameHcanus, serous coat cov- 
tissue; sp, cysts containing sporozoa; v, vertebra. I ered with cysts due to sporosperms. x 2. 
2. Transverse section showing two small cysts, one of them (sp.') in I 5. Protozoa found in intestinal canal of Dasyatis centrum, x 700. 
the midst of a muscle fiber, x 400. ct, Connective tissue with j 
sporozoa. 
