482 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



Diuieiit-ious of living worm in inilliineters: Length, 4; distance of genital ajierture from anterior 

 end, 2.3; length of (esophagus, O.Cio; diameter of head 0.23,. at genital ajiertare U.3S, two-tenths of a 

 millimeter in front of the anal aperture 0.25, at anal aperture 0.09; distance of anal aperture from 

 posterior end, 0.11. 



7. Ichlhyonemn sanguineam Rudoljihi. Mouth. 7? pp. 283, 304, pi. .\i.iii, figs. 120, 121. 



CtBTODES. 



8. Lnrval ceslofks (•Scokj: )>ol>/mor/ihtix Dujardin). In cystic duct and free in intestine. 4 , pp. 789-792, 



pi. L.xi, figs. 4-15. 7, p. 283. 

 Found fretjuentlv in 1899 and 1900. I have not been making observations on these forms (Scolcc 

 jtolymorphus) for a good many years. I have recorded their occurn-nce, however, whenever observed. 

 No doubt if special search were ma<le for them their known range in .\raerican fishes could be greatly 

 extended. On August 23, 1900, I noted these larvte m the flounder, and found among them forms 

 with a very distinct costa on the bothriuni. Red pigment spots were jiresent in the neck, and the 

 terminal sucker was conspicuous. While I was watching them I noticed that four had attached 

 themselves to the scolex of a tetrarhynchus, which was in the same dish, thus tecoming ecto-parasites, 

 or carnivorous enemies of the latter. 



9. Jihi/iicliubolhriuiii butbij'ir Lintfin. Cysts on viscera. 



Larval cestodes encysted in the mesentery are very common, and have Ijecn noted on various 

 occasions. Many of them have been too immature for identification. Noted on six dates in 1S99 and 

 on four in 1900. 'I, p. 767. 7, p. 283. Some of these small cysts contained larva- with proboscides 

 resembling those figureil in •!, pi. LXiii, fig. 12. 



10. Khiimhuhollirium imjKirixjjiiic Linton. On viscera. 4, pji. 799-801, pi. lxiv, ligs. 9-12. 



11. liUijitchohothrinm lieUronpiiie Linton. On viscera. 7, p. 283. See 4, p. 799, pi. i,xiv, figs. 3-8. 



12. lihiinchoholhriiiin .tpeciostim Linlon. On viscera. 4, pp. 801-805, \>\. i..\iv, figs. 13, 14, and pi. 



Lxv, figs. 1-7. 



13. TeJrnrhi/iichus binulcdlux Linton. In sulmnicosa of stomach. 4, jip. slO-SU. pi. i.xv:, figs. 11-15. 



7,"p. 283. 

 Cysts with larv;n (Tetrarliiini-hnx) found very frequently in subniuco.«a of stomach in 1899 and 

 1900. Some appear to be T. robiinlim (4, p. 452), Ijut the most of them are T. blKub-tihix. 



14. Ti:tr<irliiiiiclni.t hiciilur I'.artels. 



.V single specimen, .\ugust 15, l>s!i;), in material washed out of alimentary canal. Color, white. 

 In other jiarticulars it agrees with this species; length, 3.5 mm. See 4, [ip. 8I3-S15, pi. lxviii. 

 ligs. 1-6. 



15. Siinljolhriuin tilirolb- Linton. Encysted in stomach wall. I, p. S17. pi. i.xvm. fig. s. 



TKEM.V'i'OUlCS. 



16. DicUdophora iillini.1 Linton. [<)clopUclanum affiiie Linton.] Mciiilli. I. pp, 511-511', |,1. xi.. ligs. 



10-13, anil pi. xi.i, figs. 1-5. Found twice in lS99and once in liKKi, one in each fiml. 



17. Dislommii apiiiii(l'>i-iibitinii Kudolphi. Intestine. 7, pp. 283, 2.s<), pi. xxxvi, ligs. 25, 26. .Inly 



15, 1899; 2. 



18. DiMonmiii inmiliirllii Lintnii. Intestine. .\ug. IS, IS'.ISt; 1. ,S-e I, pp. 518-520, pi. xi.iv, figs. 2-S. 



19. Didoiiiiim rildbixiiin Lint.m. Iiilistiiii'. Aug. 23, 1.S!I9. .Inly 2il. 1!H)0, few. .Sv 7, p. 290, pi. 



xxxvu, figs. 38, 39. 

 Two small distomes were obtained fmm a Hnunder from Muskeget Channel, .Vugust 17, 1899, 

 which resemble this species in the general arrangement of tlie reproductive organs and proportions of 

 the acetabula, etc. The bodies, however, were transversely corrugated in a very jjeciiliar manner. 

 This has Ix^en alluded to under Mlcru'jiiilii.i (Xo. 6, I>. .liiiijib:!). The postt-rior edge of the acetahuhnn 

 was deeply notched so as to form two or three blunt, digitate lobes. [I'l. xxx, fig. 336.] 



20. Distoinum piub'nn Linton. 7, i>i>. 283, 290-291, pi. xxxvii, figs. 40-47. 



21. Dixloiiiiiiii sp. [I'l. XXXI, fig. 345, pi. xxxii, fig. 352.] 



Three small ilistomes collected August 22, 1899, are here referreil to briefly. They bear a close 

 resemblance to No. II under lihumbit.i Iriiirniilhus. One of the.se wa" sketched at the time of collecting 

 (lig. 352). This specimen bears some resemblance to D. purkiDi, but .the u'sopliagus is much longer 



