436 BULLETIN OF THE TNITED STATES FISH COMMISSION. 



5. Rhi/nchobothrium helerospine Linton. 4, p. 799, pi. lxiv, figs. 3-8. See under MuMelus canis, No. 8. 



6. RhyncMxAhrium imparinpim: Linton. 7, p. 276. See under Raja erinacea, Xo. 4. 



7. Rhijncliobolhrium bitlhi/ir Linton. Aiijj;. 12, 1899; numerous cysts on viscera. 



8. Rlu/nchohothrium. Cysts. 4, p. 794, pi. l.xii, fig. Ifi, and pi. l.xiii, fig. 1. 7, p. 276. 



9. Larval ceftodes (Scolex polymorplmsDuyATdin). 7, p. 276. Seen also Aug. 12, 1899. 



■rRE>I.\TODES. 



10. Distomum (/randipornm Rudolphi. 6, pp. 520-521, pi. .xliv, fig. 9. Aug. 28, 1899; 1. Length, 



10 mm. See under Pxeudopleunnu'iiis aiiiericanu», No. 6. 



11. Dixlomum vUellomm Linton. Aug. 12, 1899; 1. See under Merlucciu» bilinearix, No. 9. 



12. Diitomum sp. [See pi. -xxv, figs. 228, 229.] Aug. 10, 1900. 



Resembles species figured in 7, pi. .x.x.xiv, fig. 72. Dimensions in millimeters: Length, 1.96; 

 breadth, 0..^S; diameter of oral sucker 0.19, of acetabulum 0.19; length of ityrifurm pharynx, 0.17, 

 greatest breadth 0.1; ovum 0.076 and 0.038 in the two i)rincipal diameters. Cirrus and uterus pass to 

 right of acetabulum. Specimen not in good condition; probably introduced with food. 



Leptocephalus conger, Conger Kel. 



Fish. Aug. 2, 1899; 1; fish in stomach. July 30, 1900; 1; fish in the alimentary canal. July 

 31, 1900; 1; a herring and 3 butter-fish in stomach; cry.stalline lenses and other fragments of fish 

 in intestine. August 25, 1900; I : young eel and fish in stomach; fin rays and an annelid (Nereix) in 

 intestine. 



ACAXTIIOCKPn.\L.V. 



1. Echiitorliynthus ucus Kudolplii. July 31, 1900; 7; stout-bodied, yellowish; flaccid when lir.-t 



removed from intestine, V)ecame plump after lying in sea water. Aug. 25, 19(X); 1; length. 

 20 nun. For account of species, see I, p. 492, and !l, p. 52.5. 



XE.MATODKS. 



2. Ihiciiili" liUiiis Dujardiii. [I'l. xvi, figs. 203,204.] July :!l), 1900; 1; from ccl tjiken by schooner 



(Iriiininix off (iay Head in (in tn 70 fathnms; collected by C. W. Stone. 

 This specimen agrees with nujanlin's description, but is smaller in .-ionu' <if its dimensions. It 

 probably came from the intestine, since it is an adult female with ova in the uterus und<T;;(iiMg 

 segmentation. Dimensions in millimeters: lA-ugth, 20; diameter of head, 0.26; of body at middle. 

 0.41; length of (esophagus, 1.23; distance of anal aperture Irom jiosterior enil, 0.(i5; ova, 0.08 and 0.05 

 in the two principal diameters; of nearly uniform iliameter throughout. \ few found .Vugust 25, 1900. 



3. Immaluri. nemnUHicx. Encapsuled on intestine. Sevend. Same host as No. 2. 



( tXTOOKS. 



4. Rliiiiii-hohulh rliim imjiarhjihie Linton. Several larvie in pyriform blastocysts and cy.sts on serous 



coat of intestine. Same host as No. 2. For description of s|K'cies, see it, p. 840. 



5. Ixirmd a'xtoili'ii {Scoli\i: piiliiiiiorjiliiifi Ihijardm). Free in intestine. Aug. 2, 1899; July 31, 191X). For 



account of similar forms see 5, ]>. 7s9. 



•nii:.MATi)i)i:>i. 



6. DlMomuiit ximjihr [i\h\iA\'\i\. .\ng. 2, 1899; 2. For description of species, see 6, 525. 



Dinieusiiius of specimens in water, given in nullimeters: Length, 4; diameter, anterior 0.21, at 

 middle O.Ot, posterior 0.21; lengtli of oral sucker 0.21, <lcpth 0.19; length of acetabulum 0.37, 

 depth 0.36; ovum, 0.073 and 0.045 in tlie two piinciiial diameters; length of second spei'imen, 2.07. 

 See under MirroijaJiits, No. 6. 



7. Dhlomnm vitclloniun biiilnn. Intestine. 7. ]>. 290, ]il. xwvii, fig>!. ;W,39. 



Six small specimens which agree be.<t with this species; collected August 25, 1900. The worms 

 were tupgid and motionless, although they were examined as soon as collected, at whiih time they 

 had been put in salt water. Some specimens of this species, collected at the same time as these, but 



