FISH PARASITES COLLECTED AT WOODS HOLE. 



36. Pollachixis virens, ''u 



July 14; one; collected by II. M. Kelly. 



Ascaris clamla, about 50; stomach. See page 302 for additional notes. 



Disfomniii ocreaiinn Molin, about 100; stomach. See page 2*s for additional notes. 



Oclobolhriinii denticulatum Olsson, one; gills. See page 286 for additional notes. 



Rhynchobothrium, encysted; mesentery. 



37. Paralichthys dentatus, Summer Flounder. 



(1) July 19; five; stomachs contained only young squid (Loligo pealil}. Larval cestodes in cystic 

 duct of one, as in squeteague. also many scattered through the chyle of the intestine. Many cestodes 

 (Tetrarln/ni'ints) encysted in walls of stomach and intestine of each. A lew nematodes, immature, 

 encapsuled iu mesentery of each. 



(2) July 20; one, large; stomach empty ; numerous external copepod parasites on skin; one lernean 

 parasite affixed to palate; an encysted larva? (TetrarJiyn chits) with margins of bothria bristly, in 

 submncosa at pyloric end of stomach ( T. robnstus). (Cestode Parasites of Fishes, p. 452.) A few 

 encapsuled nematodes, immature, and an encapsuled Echinorhynchus 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 ; larvie ( Tetrarhynchus) 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 ; one leruean parasite in mouth; 

 cestode cysts iu 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- 

 rhynchits larvae encysted in stomach wall, rather numerous in vicinity of pylorus. 



(6) July 2,7; 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 (Tetrarhynchus) 

 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 in 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 Rhynchobothrium heterospine. 



(9) August 8; one; stomach contents not noted, probably empty. Nematodes and one Echino- 

 rhynclius encapsuled in mesentery. The latter had its proboscis partly retracted. When it was placed 

 iu the killing fluid the proboscis was gently pulled, when a slender neck made its appearance and the 

 specimen was identified as a young E. proteit*. 



(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 (Bhynchobothrium heterospine). 



(11) August 25: two; stomachs with young scup (Stenotomiis cJtrysopft) and young squid (Lolit/o 

 pealii). The commonly occurring cysts were found iu 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 (Iditltconcma sani/iiinriini) partly embedded on inside of cheek; see page 304 for the 

 description. A few small distoma (l)ifttimiHnt dciitatitm) were obtained from the intestine; see page 

 294 for description; also two small distoma, belonging to the submenus Apoblvnut, which I refer to 

 the species J). 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 encapsuled nematodes and several young 

 eucapsuled Echinorhynchi, orange yellow, from viscera, identified as E. /irolciix. Numerous distoma 

 (/>. piidenx sp. nov.) See under date of August 25 and page L>90 for description. The usual cysts were 

 present in the stomach walls of these flounders; indeed, they appear to be rarely, if ever, absent. 



