484 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
NEMATODES. 
2. Immature nematodes ( Ascaris ). [PI. xm, figs. 152,153.] 
Found on each of the dates given above. These appear to be identical with small nematodes 
found in a number of different species of fish. Some of these were compared with specimens from 
Urophycis chuss and Lopholatilus chamseleonticeps. All of these were living at the time. They agreed in 
all essential characters. At the junction of the oesophagus and intestine there is a diverticulum from 
each, one from the intestine which extends forward parallel with the oesophagus and one from the 
oesophagus which extends backward parallel with the intestine. 
Dimensions in millimeters of a small specimen collected August 2, 1900: Length, 10.5; diameter 
of head, 0.07; diameter at nerve ring, 0.17; diameter at anal aperture, 0.11; distance of nerve ring from 
anterior end, 0.36; length of oesophagus, 1.45; distance of anal aperture from posterior end, 0.19. 
Figs. 152 and 153 are sketches of a specimen from a lot of immature nematodes collected by the 
U. S. Fish Commission in 1883, station 1158. Length, 22 mm., of nearly uniform diameter throughout 
(0.4 mm.); distance of anal aperture from posterior end, 0.15; diameter at anal aperture, 0.12. 
CESTODES. 
3. Dibothrium punctatum Rudolphi. 
A small, slender, immature specimen from the intestine, collected August 16, 1899, probably 
belongs to this species. See 54 , pp. 731-736, pi. ii, figs. 1-4. 
4. Larval cestodes ( Scolex polymorphus Dujardin). Free in intestine. Found both in 1899 and 1900. 
See 4 , pp. 789-792, etc. 
5. Rhynchobothrium. Encysted on viscera. Found in 1899. 4 , p. 798. 
6. Tetrarhynchus bisulcatus Linton. Submucosa of stomach. Found in 1899 and 1900. See 4 , p. 
810, etc. 
Bothus maculatus ( Lophopsetta, macidata), Sand-dab, Window-pane. 
NEMATODES. 
1 . Immature nematodes (Ascaris) . 
Common in this as in the other flounders, encapsuled on viscera. A small lot in the U. S. National 
Museum collection from the Grand Banks (schooner ,/. A. Chapman) in poor condition, as if macerated, 
from turbot, here recorded. Lengths, 37 mm. to 55 mm.; greatest diameter, 2 mm. Anteriorly 
attenuate. [PI. xm, flgs. 154-156.] 
CESTODES. 
2. Dihothrium punctat/urn Rudolphi. Intestine. I , pp. 731-736, pi. ii, flgs. 1-4. 5, p. 430. 
3. Rhynchobothrium imparispinc Linton. 4 , pp. 799-801, pi. Lxrv, figs. 9-12. 
Limanda ferruginea, Rusty Flat-fish. 
FOOD. 
The alimentary tract in some cases contained enormous numbers of crustaceans; of these, 
amphipods were most numerous, but shrimps, schizopods, small crabs, Caprella, and Squilla also found; 
annelids, different species; bivalve and univalve mollusks; small fish. 
ACANTHOCEPHALA. 
1. Echinorhynchm acus Rudolphi. Intestine. 51, p. 525, etc. 
In two lots of the U. S. National Museum collection. Off Block Island, 1880. August 5, 1899. 
August 16, 1900; 30, a few quite small. August 2, 1900; 14. 
NEMATODES. 
2. Immature nematodes (Ascaris). 
August 5 and 16, 1899. These are similar to immature nematodes found in a great variety of 
fishes. Most of those which I have seen appear to be young ascarids. 
