Bull. U. S F. C. 1899. (To face page 492., 
Plate XXV. 
270. Diboliirmmmicroceyhalam Rudolpbi, from intestine of Mola mold. 1 
Head with anterior segments, normal: life. < 65. 
271. Abnormal lengthening cf anterior segments; life. 65. 
272. Tsenia sp. from intestine of Anguilla ckrysypa. Head, x 40. 
273. Head of another specimen. 50. 
274. Tsenia sp. from intestine of Sphyrna zygse.na. X 2. 
275. Head of same, x 65. 
276. Posterior segment, cp, Cirrus pouch; o, ovary; %i, uterus; v, vagina; 
vg, vitelline glands, x 8, 
277. Sagittal section of segment. X 100. c, Cirrus; v, vagina. 
278. Sagittal section through cirrus pouch, c, Cirrus; cp, cirrus pouch; 
f, testes', v, vagina; vg, vitelline glands, x 100. 
279. Cirrus, from transverse section of segment. X 300. 
280. Transverse section of cirrus, showing cells of prostate gland 
and spines on retracted cirrus, x 400. 
281. Segmenting ovum, in uterus. X 300. 
