PARASITES OF FISHES OF THE WOODS HOLE REGION. 451 



CESTODES. 



6. Dibothrium crasslrepn Rudolphi. 



July 21, 1900; ;5(> wolices obtained from one fi.sh. The loni;e!^t of the strobiles, none of whieli 

 are mature, was 40 mm. Seolex nearly globular; when at rest broader tlian long in some. (See No. 8. 

 umlar Mcrlucciiis biliimtris.) [PI. .wii, figs. 142-144.] 



7. Rhj/nchohothrium buthifer Linton. Cysts on viscera. 4, p. 793. Aug. '■>, lilOO. 



S. lilniti'hobdthrium tiperioaum Linton. Cysts on viscera. 4, pp. 801-80.5, ]il. i.xiv, ligs. 13-14, and 

 pi. i..\v, figs. 1-7. T, p. 278. July 21, 23, 1900; Aug. 13, 1900. 



9. Tiimrliifnchus bisulcalus Linton. 



I'snally present in great abundance in cysts in the stomach wall; be.st seen by separating the 

 nuiscular coats from the siibniuco.sa, when the cysts will be seen lying in the submucosa. !,]>. 4St) 

 (/,'. hl.tukalus). See also -l, pp. SIO-.SU. 7, p. 27S. July 21, 23, 1900; Aug. 1. IIKIO. 



10. Tftrdrhipirliux criiiaciii.i Beneden. Cysts on viscera. 8ee 4, pp. .S11-SI2, pi. i.xvii, figs. l-S. Aug. 



13, 1900. 



11. Olohotlmnin ilipunrnm Linton. 4, pp. S0(>-S07, pi. i..\vi, figs. 1-5. 



12. Synh)ihritim fiUfiillr Linton. Cysts on viscera. 4, p. 818. 7, p. 27S. .lulv 21, 23, 1900; .\ui;. 



I, 13, 1900. 



In specimen examined Aug. 1 several large cyst.s were found on .spleen, pyloric ca'ca, and inte-stine, 

 anil line in subnuicoga of stomach. Cysts with degenerate conti'nts. July 23, Aug. 11, 1900. 



13. iMriml reslodes (Scolex jMlymorphus Duydrdin). Small, free in intestines. See 4, pp. 789-792. Aug. 



26, 1899; July 21, 190O. 



TKEMATODES. 



14. IHMoiiiiiiii inrintiirllii Linton. Intestine. See 6, pp. .")1S-.51'0, p|. .\i,iv, figs. 2-8. ,Julv 27, Au". 



II, 14, 1S90; 1(1 in all. 



15. Di-sloiiiiuii sp. [I'l. .\,\.\i, figs. 341-344.] 



Brief mention is here made of a few small distomes found on the following dates: .\ugust 14, 17, 

 26, 1899; August 18, 1900. They are characterized liy lieing covered with low, flat spines aj:! in I). 

 (/f/fdt/Hm, mouth unarmed, suckers of about eijual size, and osophagus longer than [iharvnx. The 

 Ijody is white, dejiressed, usually oval, lint elongated forms also sepn, both forms occurring in same 

 lot. Similar forms were found in the fiounder (fig. 345) and .scui) (fig. 346); spineless di.stomes agreeing 

 in other respects with these were seen in the flounder (fig. 352), and in the butter-fish (fig. .353) ; a 

 related form from the nuunmichog is shown in fig. .354. 



16. Di.itDinmn vitellosum \j\nton. [I'l. x.\x, figs. 337-339.] See 7, p. 290, pi. .xxxvii, figs. 38, :H9. Aug. 



26, 1899; July 21, 1900; Aug. IS, 25, 29, 1900. 

 I here record examples from the blue-fish of a species of distomc found in a uvmdier nl hosts which 

 I have entered in my notes as small, cylindrical, with prominent acetabulum. In many cjise.s, where 

 tap water was used for washing out the contents of the alimentary canal, distomes were found whicli 

 had been killed by contact with the fresh water. Cnder such conditions the distonie assumed a 

 characteristic position in which the neck w as reflected nearly at right angles to the body. In sea water 

 or in salt solution the worm remains active and is then seen to be of very varying form. The species 

 is near 1). xiinpkj;. See remarks under No. 6 of Micnyadus. 



17. Micriicotyli; sp. From gill filaments. [PI. xxvii, figs. 299-306.] 



Prof. C. B. AVilson, while collecting jiarasitic cojiepods from the gills of a large blue-fish, Septenil>er 

 3, 1900, called mj' attention to some trematode worms. These belong to the genus Min-omli/li'. 

 They are slender, thin, and strap-like worms, attenuate both anteriorly and posteriorly. They attach 

 themselves to the gills by the posterior part of the Ixidy, which, for a third of its length, is provided 

 with a great number of minute suckers. The worms were very active with the body proper, although 

 remaining firmly attached to the gill filaments, in which position they were killed. They were 

 transparent, bluish white, the vitellaria marginal and dark brown. They were collected just as I was 

 about to leave Woods Hole, so that l)ut little time was available for the study of the living worms. 



