Bull. U. S. F. C. 1899. (To face page 492.) 



Plate XXIV. 



262. Tetrarhynchus btsulcatus, continued. Section o{ parasite, cut I 266. Dibotkriam crasskeps Rudolphi, from intestine ol Merluccius 



longitudinally, in submucous cuat of stomach, x 50. bUin^artJi. Marginal view of head, x 40. 



263. Transverse section through muscular bulb of proboscis, x 400. [ 267. Lateral view of head, x 40. 



n. Nerve cells; r, retractor of proboscis. 268. Posterior end of strobile. > 40. 



264. a. Hooks in retracted proboscis of encysted parasite. ^, 800; b, c, ' 269. Dibot/irium aiigus/atmn Rudolphi. from intestine of Mertuccius 



groups of nerve cells lying beside contractile bulb, x 400; rf, i biluicarin. n, Head, x 50; 6, median segments, x 50; c, poste- 



same. x 750. ' rior segments, x 30. 



265. Transverse sectionof dorsal nuistrles of Rhombus triamnf hu.< with \ 



cysts conia.ining ahijnchobotkriam up. x 30. (See255-256a.) 1 



