PARASITES OF FISHES OP THE WOODS HOLE REGION. 437 



from the blue-fish, remained active for a long tifne. It is likely that these had been introdiieed along 

 with food into the alimentary tract of tlie conger and were there in an uncongenial place. 



Tarpon atlanticus, Tnrpon-. 



NEMATODES. 



1. frhthyonemn f;loh!cf]%f Rndoliihi. [PI. xvnt, figs. 216,217.] U. S. National Museum collection. 



A tangled ma.ss; original number of constituent individuals not maile out. The longest piece, 

 when ilisentangled, measured 385 mm.; aggregate length of pieces, 3 meters; diameter about 1 mm. 

 I'terus tilled with ova. In the earlier folds the ova were dark amber color, spherical, 0.014 nun. in 

 diameter; in later folds the ova were light andier color, elliptical, 0.024 nnn. to 0.020 mm. in the longer 

 and 0.02 mm. in the shorter diameter. 



CESTODES. 



2. Jyihiilliriiiin litciiiidhiiii Linton. 5, i>]i. 4.3.5-436, jd. xxx, figs. 7-16, and pi. xxxi, figs. 1-7. 



Clupea harengus, ITiTriiig. 



FdOII. 



Only young fish have been exanuned. The young herring is an indiscriminate surface feeder, as 

 the following food notes will show: 



July 17, 1899; 3. Stomachs with young sijuid and shrimp; one filled with nereisdike annelid.s, 

 about 30 nun. iii length. 



.July 26, 1899; 23. Coi-iepods and megalops of crab in alimentary canal. 



July 27, 1899; 4. Alimentary tract with teeth and setaj of annelids. 



Jidy 31, 1899; 100. Small; about 30 mm. in length. Copepods ami annelids in stomachs. 



August 8, 1899; 7. Small Crustacea and diatoms. 



July 9, 1900; 12. Eighty millimeters in length. Alimentary canals filled with copepods. 



NEM.^TODES. 



1. Axcitrix. immature. 



U. S. National Museum collection. These agree with descriptions of Aynnumema cnpmilaria, but 

 are evidently young ascarids. Length, 25 mm., tapering more anteriorly than posteriorly, with 

 posterior end minutely mucronate. 7, p. 277. July 27, 1899; a few ency.sted on viscera. August 

 12, 1899; 2 small nematodes from viscera. 



CESTODES. 



2. Rhi/iiclioljotliriiiin iinjxtrisphw Linton. .Inly 17, 1899. Encysted in stomach wall. Fnr dcscriiition 



of species, see 2, p. 840. 



3. Rhynchohothrium. LarvK encysted on viscera. 7, \k '111. July 26 and 27, 1899; a fen'. One of 



these is sketched in fig. 229 of pi. xx. 



4. Ijii-ml frdodf {Scolcx polymm-plius DuJAnWn) . Small. Free in intestines. July 17, 1899; numerous. 



July 31, 1899; numerous. For account of similar form.s, see 5, pp. 789-792. 



TI!EM.\TODES. 



5. Dktomnm apprmliriilaliim Rudolphi (?) . Intestines. July 26, 1899; 9. Jvdy 27, 1899; a few. July 



31,1899; 20. .A.ug. 8, 1899; several. Aug. 12, 1899; 12. July 9, 1900; 2. For an account of 

 this .species, see 7, p. 289, pl.xxxvT, figs. 25, 26. 



6. Dixlomum I'itelloxiiin Lintoiv. See 7, p. 290, jil. xxxvii, figs. 38, .39. July 31, 1899; 1. 



I record under this name a small cylindrical distome seen in small number but in various liosts 

 in the suunners of 1.S99 and 1900. The measurements on this siiecimen from the herring agree with 

 tho.se of I). ntelhiHU}!). There is an evident (.esophagus, wliich was not made out in the sjiecimens taken 

 in the summer of 189S. 



7. Distomnm bothryophoroii 0\it>>on(?). July 26, 1899; 3. .Inly 31, 1899; few. 



This species found in tlie herring and alewife in the sununer of b899. The body is short, fusiform, 

 diameter greatest at acetabulum, about four-tenths of length of body. A few dimensions of one from 

 the herring, in glycerine, given in millimeters are: Length, 0.87; length of oral sucker, 0.12, dei)th 

 0.13; length of pharynx, 0.065, depth 0.08; length of acetabulum 0.32, depth 0.15; ova, 0.02 and 

 0.013 in the two iirincipal diameters. The specimen was lying on its side and was considerably 

 rtattened imder the compressor. Further description of this species under l^niudobus pmudoharengua. 



