Bull. U. S. F. C. 1 899. (To face page 492.) 
Plate XXX. 
331. Distomum simplex Rudolphi, from Micro fjad us tomcod: young- 
specimen compressed and killed by application ol' heat. Ovary 
very indistinctly lobed. cp, Cirrus pouch; ex, excretory vessel; 
cj, genital aperture; n, ovary; /, testes; vrj, vitelline glands; ?/;•, 
yolk reservoir, x 05. 
332. An adult with ova. Letters as in fig. 331. x 46. 
333. Distomum vitcllosum Linton, from Stenotomus clirysops; specimen 
made turgid by placing in fresh water. :< 40. 
334. Another from same host, but collected on different date, anterior 
end. x 40. 
335. A specimen from Mcrluccius bilinear is. x 50. 
330. A small specimen, finely corrugated with transverse wrinkles, 
from Paralichthys dentatus. x 100. 
337. A specimen from Pom atom ns saltatrix; sketched from living worm 
slightly compressed, x 65. /, Posterior flaps, which were used 
by the worm as independent organs, which appeared to have 
a kind of clasping function. 
338,339. Two other smaller individuals from same lot, made turgid 
with fresh water, x 65. 
340. Specimen from Pseudopleuronedes amcrica n us. 
a and 5, Sketches of same worm in different stages of con- 
traction. x 20. 
