PARASITES OP FISHES OF THE WOODS HOLE REGION. 
453 
Palinurichthys perciformis, Rudder-fish. 
FOOD. 
Squid, small crustaceans, univalve mollusks. ( 7 , jn 279.) Salpa and a slender green alga found 
in the alimentary tracts of two fish from Menemsha, September I, 1900. 
ACANTHOCEPHALA. 
1. Echinorliynclius prist is Rudolphi. Intestine. (Variety tenuic.ornis.) pp. 531-532, pi. i.vi, figs. 
39—11, and pi. lvii, figs. 42-53. 7 , p. 279. 
CESTODES. 
2. Larval cestodes ( Scnlex polymorphus Dujardin). Free in alimentary tract. 4 , pp. 789-792, pi. lxi, 
figs. 4-15. 7 , p. 279. Found also Sept. 1, 1900. 
TREMATODES. 
3. Distomum pyri forme Linton. Intestine. 7 , pp. 279, 292-293, pi. xxxviii, figs. 52-59. Found Sept. 
1, 1900. 
Rhombus triacanthus {Stromateus triacanthus). Butter-fish. 
FOOD. 
Stomachs of larger fish usually empty, but a few fragments of fish occasionally seen. In the 
alimentary tracts of smaller specimens copepods, annelids, and small fish were found. Sept. 1, 1900, 
25 small fish were examined. The food consisted principally of amphipods. 
ACANTHOCEPHALA. 
1. Echinorliynclius sagittifer Linton. July 24, 1900. Encapsule^d on viscera. See 1 , pp. 493-496, pi. 
vi, figs. 1, 2. 3 , pp. 535-536, pi. lix, fig. 80. 
NEMATODES. 
2. Cucullanus sp. 
U. S. National Museum collection; Vineyard Sound; V. N. Edwards, collector. One female, with 
segmenting ova; oesophagus sinuous; body of nearly same diameter throughout. Dimensions in 
millimeters: Length, 9; diameter, 0.38; length of oesophagus, 0.5; diameter of oesophagus 0.05, at 
anterior end 0.09; diameter of head, 0.12. 
3. Immature nematodes. On viscera. [PI. xii, figs. 132, 133.] 7 , p. 279. 
Very abundant. Found in the majority of specimens examined in 1899 and 1900; small, pale 
red; particularly abundant on pyloric caeca. A specimen found in the stomach of a sea bass yielded a 
large number of these worms. If the process of digestion had proceeded a little further, the sea bass 
would have been the accredited host of these nematodes. Dimensions in millimeters: Length, 13; 
diameter, head 0.14, 1 mm. from head 0.28, maximum (toward jiosterior end) 0.34, 1 mm. from 
posterior end 0.28, at anal aperture 0.23; distance from anal aperture to posterior end, 0.36. 
CESTODES. 
4. Bhyncliobotlirium. Cysts on viscera. 7 , p. 279. Numerous examples were found in the summers 
of 1899 and 1900. 
An interesting case of abnormality was noted in a specimen collected July 27, 1899. Only 
one-half the larva — i. e., one bothrium with its pair of proboscides, including the contractile bulbs — 
was present. This could not have been a case of mutilation, since it was seen to be abnormal when it 
issued from the blastocyst while under the compressor. The hooks on the retracted proboscides of 
this specimen resemble those of Tt. bulbifer. 
5. Rhynchobothriuvi. Cysts in muscles. [PI. xxm, figs. 255-25 6a, and pi. xxiv, fig. 265.] 
On August 26, 1899, two butter-fish, which had been cleaned and prepared for the table, were 
submitted to me by Dr. F. Judson Herrick, who, after having had an opinion rendered regarding their 
condition, decided to allow them to be devoted to the cause of science. The muscles between the ribs 
contained great numbers of small cysts. When one of these was compressed, a blastocyst was liberated, 
