Bull. U. S. F. C. 1899. (To face page 492.) 
Plate XXXI. 
341. Distomum sp. from Pumatomus sallaifix, slender variety, x 100. 
342. Spines on neck of same, x 400. 
343. Oval variety, x 100. 
344. Spines on neck of same, x 400. 
345. Probably same species, young, from Paralichthys dentatus. 100. 
346. Species near Distomum pyrijoriue Linton, from Stenotomus chry- 
sops. X 100. 
[See figs. 352-354 and descriptions in text..] 
347. Distomum, ylobiporum Rudolphi (?), from Pseudopleuroncct.es 
americanus. x 30. y, Genital aperture; o, ovary; t, testes; 
vg, vitelline glands. 
348. Distomum sp. from Raja her is. x 8. 
319. Same, in glycerine. Letters as in fig. 347. x 11. 
350. Distomum sp. from Gastcrosteus bispi.nosus. 100. 
351. Young distome from Achirus fasciatus. : 220. 
