PARASITES OF FISHES OF THE WOODS HOLE REGION. 
437 
from the blue-fish, remained active for a long time. It is likely that these had been introduced along 
with food into the alimentary tract of the conger and were there in an uncongenial place. 
Tarpon atlanticus, Tarpon. 
NEMATODES. 
1. Ichthyonema globiceps Rudolphi. [PI. xvm, figs. 216,217.] U. S. National Museum collection. 
A tangled mass; original number of constituent individuals not made out. The longest piece, 
when disentangled, measured 385 mm. ; aggregate length of pieces, 3 meters; diameter about 1 mm. 
Uterus filled with ova. In the earlier folds the ova were dark amber color, spherical, 0.014 mm. in 
diameter; in later folds the ova were light amber color, elliptical, 0.024 mm. to 0.026 mm. in the longer 
and 0.02 mm. in the shorter diameter. 
CESTODES. 
2. Dihothrium laciniatum Linton. 5, pp. 435-436, pi. xxx, figs. 7-16, and pi. xxxi, figs. 1-7. 
Clupea harengms, Herring. 
POOD. 
Only young fish have been examined. The young herring is an indiscriminate surface feeder, as 
the following food notes will show: 
July 17, 1899; 3. Stomachs with young squid and shrimp; one filled with nereis-like annelids, 
about 30 mm. in length. 
July 26, 1899; 23. Copepods and megalops of crab in alimentary canal. 
July 27, 1899; 4. Alimentary tract with teeth and set* of annelids. 
July 31, 1899; 100. Small; about 30 mm. in length. Copepods and annelids in stomachs. 
August 8, 1899; 7. Small Crustacea and diatoms. 
July 9, 1900; 12. Eighty millimeters in length. Alimentary canals filled with copepods. 
NEMATODES. 
1. Ascaris, immature. 
U. S. National Museum collection. These agree with descriptions of Agamonema capsularia, but 
are evidently young ascarids. Length, 25 mm., tapering more anteriorly than posteriorly, with 
posterior end minutely mueronate. 7, p. 277. July 27, 1899; a few encysted on viscera. August 
12, 1899; 2 small nematodes from viscera. 
CESTODES. 
2. Rhynchobothrium imparispine Linton. July 17, 1899. Encysted in stomach wall. For description 
of species, see 2, p. 840. 
3. Rhynchobothrium. Larvse encysted on viscera. ’7, p. 277. July 26 and 27, 1899; a few. One of 
these is sketched in fig. 229 of pi. xx. 
4. Larval cestode {Scolex polymorphous Dujardin). Small. Free in intestines. July 17, 1899; numerous. 
July 31, 1899; numerous. For account of similar forms, see 5, up. 789-792. 
TREMATODES. 
5. Distomum, appendici datum Rudolphi (?). Intestines. July 26, 1899; 9. July 27, 1899; a few. July 
31,1899; 20. Aug. 8, 1899; several. Aug. 12, 1899; 12. July 9, 1900; 2. For an account of 
this species, see 7, p. 289, pl.xxxvi, figs. 25, 26. 
6. Distomum vitellosum Linton. See 7, p. 290, pi. xxxvii, figs. 38, 39. July 31, 1899; 1. 
I record under this name a small cylindrical distome seen in small number but in various hosts 
in the summers of 1899 and 1900. The measurements on this specimen from the herring agree with 
those of D. vitellosum. There is an evident oesophagus, which was not made out in the specimens taken 
in the summer of 1898. 
7. Distomum bothryophorqn Olsson (?) . July 26, 1899; 3. July 31, 1899; few. 
This species found in the herring and ale wife in the summer of 1899. 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, depth 
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 principal diameters. The specimen was lying on its side and was considerably 
flattened under the compressor. Further description of this species under Pomolobus pseudoharengus. 
