Bull. U. S. F. C. 1 899. (To face page 492.) 
Plate XXIII. 
255. Rhynchobothrium sp. Cyst from muscles of Rhombus triacanthus, 
compressed to show blastocyst and contained embryo; life. 
X 100. (See also fig. 265.) 
256, 256a. Two views of an embryo, x 300. 
257-260. Tetrarhynchus elongatus Wagener, from liver of Mola mola. 
Proboscis, x 160. 
259, near base; 260, base. 
261. Tetrarhynchus bisvlcatus Linton. Section of stomach wall of 
Cynoscion regalis, parasites encysted in submucosa, x 30. 
