FISH PARASITES COLLECTED AT WOODS HOLE. 
283 
36. Pollachius virens, 0 ullooTc . 
July 14; oue; collected by H. M. Kelly. 
Ascaris clavaia, about 50; stomach. See page 302 for additional notes. 
Distomum ocreatum Molin, about 100; stomach. See page 288 for additional notes. 
Octobotlirium denticulatum Olsson, one; gills. See page 286 for additional notes. 
Bhynchoboihrium, encysted; mesentery. 
37. Paralichthys dentatus, Summer Flounder. 
(1) July 19; five; stomachs contained only young squid {Loligo pealii). Larval cestodes in cystic 
duct of one, as in squeteague, also many scattered through the chyle of the intestine. Many cestodes 
( Tetrarhynehus ) encysted in walls of stomach and intestine of each. A few nematodes, immature, 
eneapsuled in mesentery of each. 
(2) July 20; one, large; stomach empty ; numerous external copepod parasites on skin; onelernean 
parasite affixed to palate; an encysted larvae ( Tetrarhynehus ) with margins of bothria bristly, in 
submucosa at pyloric end of stomach (T. rolnistus). (Cestode Parasites of Fishes, p. 452.) A few 
eneapsuled nematodes, immature, and an eneapsuled Eohinorhynchus on mesentery. In the latter the 
body was orange-colored, the head and neck translucent, colorless. 
(3) July 22; one; contents of stomach not noted, probably empty ; larva ( Tetrarhynehus) in 
stomach and intestinal wall ; and small, immature nematodes in mesentery. See also page 285. 
(4) July 23; two; stomach contents not noted, probably empty; onelernean parasite in mouth; 
cestode cysts in stomach and intestine, as in foregoing; contents of intestine washed out and 
examined with care ; numerous larval cestodes, very small and very active after lying in water for 
eight hours; same as in foregoing. 
(5) July 25; two; stomach contents not noted, probably empty; nematodes on viscera; Tetra- 
rhynehus larva: encysted in stomach wall, rather numerous in vicinity of pylorus. 
(6) July 27; one; stomach contents not noted; large number of larval cestodes from cystic duct; 
small nematode from viscera. 
(7) July 28; one; stomach contained young squid (Loligo) ; external copepod parasite on skin of 
upper side; cystic duct with large numbers of larval cestodes; rather numerous cysts ( Tetrarhynehus ) 
in submucous coat of stomach. 
(8) July 30; two; stomach contents not noted, probably empty; the usual cysts in stomach 
wall; also numerous cysts under serous coat of stomach. As the latter appeared to be new iu this 
host, the following measurements were taken, in millimeters: Length of cyst, 1.12; shorter diam- 
eter, 0.73; length of blastocyst, 0.81; length of larva, 0.52; length of bothrium, 0.18; breadth, 0.18; 
length of bulbs, 0.35; length of longest hooks, 0.021 to 0.034; bothria slightly emarginate. The 
hooks are of various shapes and agree with Rhynchohothrium hetevospirte. 
(9) August 8; one; stomach contents not noted, probably empty. Nematodes and one Ecliino- 
rhynchus eneapsuled in mesentery. The latter had its proboscis partly retracted. When it was placed 
in the killing fluid the proboscis was gently pulled, when a slender neck made its appearance and the 
specimen was identified as a young E. proteus. 
(10) August 16; one; stomach contents not noted, probably empty; the usual cysts in stomach 
wall; numerous small white cysts under serous coat of stomach, which appear to be same as those 
recorded under date of July 30 ( Rhynchohothrium heterospine). 
(11) August 25; two; stomachs with young scup ( Stenotomus chrysops) and young squid ( Loligo 
pealii). The commonly occurring cysts were found in the stomach wall. The alimentary canals of 
these flounders were washed out and search made for small distoma; only one specimen was found, 
D.pudens sp. nov. See under date of September 5 below, also page 290, for description. 
(12) August 27; one; stomach contents not noted, probably empty ; parasitic copepods on side ; 
one nematode ( lehthconema sangnineum) partly embedded on inside of cheek; see page 304 for the 
description. A few small distoma ( Distomum dentatum) were obtained from the intestine; see page 
294 for description; also two small distoma, belonging to the subgenus Apoblema, which I refer to 
the species D. appendiculatum ; see page 289 for description. 
(13) September 5; four; stomach contents not noted, probably empty; external copepod para- 
sites on side; a lernean from mouth of one; two immature eneapsuled nematodes and several young 
eneapsuled Echinorhynchi, orange yellow, from viscera, identified as E. proteus. Numerous distoma 
{D.pudens sp. nov.) See under date of August 25 and page 290 for description. The usual cy 3 t,s were 
present in the .stomach walls of these flounders; indeed, they appear to be rarely, if ever, absent. 
