476 
BULLETIN OP THE UNITED STATES FISH COMMISSION. 
The adults of both sexes are more attenuate anteriorly than posteriorly, while the males are 
shorter and relatively stouter than the females. In the female from which the measurements given 
above were taken the upper lip was unsymmetrical, oblong, length 0.2 mm. and breadth 0.22 
mm. The tip of the tail usually mucronate and minutely roughened or beset with short spicules. 
The majority of specimens in these lots were immature, and but few males were noticed. The anal 
papilke were but imperfectly made out; no postanal papillae were noted in males examined; 23 or 24 
preanal papillae on a side were counted, the posterior 8 or 10 small, pediceled, and capitate. The 
remainder, including 'a pair immediately in front of the anal aperture near the median line, are larger 
and not capitate. The number appears to be the same on each side. 
The smaller specimens were smooth; the larger often transversely rugose, especially toward the 
posterior end. The lateral alse appear to be an adult character. See under Pollacliius virens, No. 1, 
and 7 , pp. 283, 302, pi. xxxviii, figs. 105-108. 
3. Immature nematodes ( Ascaris ). Serous covering of stomach, intestine, liver, etc. 
I have examined nine lots of nematodes which came from capsules in various parts of the body 
cavity of the cod. The greater part of these were collected by Mr. Vinal N. Edwards in the months 
of November and December, 1887. These specimens for the most part agree with descriptions of 
Ascaris capsularia; that is to say, they are immature ascaricls. Specimens were found, however, which 
were sufficiently developed to make it appear highly probable that they are the young of Ascaris 
clavata. The larger specimens range from 25 to 40 mm. in length, and from 0.6 to 1.1 mm. in diameter. 
4. Cucullanus globosus Zeder. [PI. xvir, fig. 206.] 
Nine specimens from the cod, collected by Mr. Vinal N. Edwards in the months of November, 
December, 1887, and January, 1888, belong to this species. Dimensions in millimeters: Length, male 
10.5, female 15; diameter, male 0.4, female 0.35. Tail of female slender and prolonged 0.5 mm. beyond 
the anal aperture. Length of male, copulatory spines, 1.2 mm. 
cestodes. 
5. Dibolhrium rugosum Rudolph i. Pyloric caeca. 2 , pp. 750-754, pi. in, figs. 7-10. 5 , p. 431, pi. 
xxvin, figs. 9, 10, and pi. xxix, figs. 1-4. 
6. Rhynchobothrium imparispine Linton. Peritoneum. 1 , pp. 799-801, pi. lxiv, figs. 9-12. See 2 , pp. 
840-843, pi. xii, figs. 6-9. 
TREMATODES. 
7. Nitzschia papillosa Linton. 6 , p. 508, pi. xl, fig. 1-6. 
8. Distomum rachion Cobbold (?). 6, pp. 538-539, pi. liii, figs. 3-7. 
Mela.nog-rammus aeg-lefmus, Haddock. 
ACANTHOCEPHALA. 
1. Echinorhynchus acus Rudolphi. See 3 , p. 525, etc. 
Found in two lots of entozoa from this host, collected by Vinal N. Edwards in the months of 
November, 1886, and December, 1885, 10 in one, 4 in the other. The longest, a female, measured 45 
mm. ; the shortest, a male, 6 mm. 
NEMATODES. 
2. Nematodes. Immature. Encapsuled on peritoneum. 
Three lots of encapsuled nematodes from this host in U. S. Nat. Mus. collection. These were 
collected by V. N. Edwards in November, 1886, and December, 1885. The specimens in two of these lots 
agree with those from the cod, and are probably the young of Ascaris clavata. The longest is about 30 
mm. in length. The specimens in the third lot resemble Cobbold’s A. acanthocaudata. Body nearly 
filiform, but tapers more anteriorly than posteriorly. Dimensions in millimeters: Length, 28; diameter 
of body 0.75, of head 0.25; distance of anal aperture from posterior end, 0.3; length of oesophagus, 4. 
In acetic acid two systems of diagonal fibers were brought out. 
CESTODES. 
3. Rhynchobothrium imparispine Linton. Peritoneum. 3, pp. 799-801, pi. lxiv, figs. 9-12. 
