282 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



The following entozoa were found: 



Dibothrium microcephalum (Ent. Marine Fishes, n, pp. 736-745, pi. n, figs. 5-18), young and adult 

 in intestine. The largest specimen measured 50 cm. in length and 7 mm. in greatest breadth. 



Tetrarhynchus elongatiis (Larval Cestode Parasites of Fishes, pp. 812-813, pi. LXVII, figs. 9-12) 

 and possibly another species; enormously long blastoeysts burrowing in the substance of the liver. 

 The enlarged and in some cases globular portion as a rule lay immediately under the serous coat, 

 while the slender, filiform posterior part penetrated the deeper tissue. 



Distomum macrocotyle (Trematode Parasites of Fishes, pp. 522-523, pis. XLV, figs. 8-11; XLVI, 

 figs. 1-5), 1 intestine. 



D. foliatum (Trem. Par. Fishes, pp. 532-534, pis. XLIX, figs. 3-5; L, figs. 1-3; LI, figs. 1-4), 3, 

 intestines. 



D. niyroflanim (Trem. Par. Fishes, pp. 530-531, pis. XLVIII, figs. 8-11; XLIX, figs. 1,2), 1, intestine. 



D. fragile,. rather numerous. See page 295 for description. 



31. Myoxocephalus seneus, Scnl-jiin. 

 July 23; one; nothing identified in stomach. One small iiematode in the body cavity. 



32. Prionotus carolinus, Gurnard or Sea Robin. 



(1) June 5; scolices of Tetrarhynchus bisulcatits found by Dr. F. P. Gorham encysted in stomach 

 and intestinal walls; also the same cestode in muscles, but not encysted there. 



(2) July 21; one; stomach empty. One larval Rhynchobothrium and one larval Tetrarhynchus 

 found in the body cavity. 



(3) July 25; two; stomachs empty. Nematode, immature, on viscera; no other entozoa found. 



(4) August 5; three; fish scales in stomach of one, others empty. A few small nematodes 

 found on mesentery. These were immature, rather thick-walled; inner outline of body wall irregular; 

 posterior tip minutely mucrouate; intestine brownish; anterior end truncate. 



(5) August 24; two; small; stomachs empty. Three distoma from intestine. See page 295 for 

 description (fig. 71). 



33. Lopholatilus chamaeleonticeps, Tile-fish. 



September 1; five; stomachs more or less everted and empty; intestines with considerable 

 quantities of partly digested crabs. The fish were taken in 135 meters (75 fathoms) of water south of 

 Newport. The viscera of these fish had been put in formalin and were examined by me September 5. 

 The contents of stomachs and intestines were examined with great care for entozoa. There were 

 found about a half dozen fragments of immature nematodes, evidently taken in with the food; one of 

 them was coiled up, as if it had been eucapsuled; one cestode in two pieces, small, could not toe iden- 

 tified, but looks like To-nia. 



One distomum was found which seems to be new. See page 289. Distomum fcecundum sp. nov. 



34. Opsanus tau, Toad-fish. 



September 5; two; fragments of fish in stomach. Nematodes in stomach and intestine of each, 

 Ascaris htibcmt sp. nov. Eight specimens from both. See page 302 for description. 



35. Merluccius bilinearis, Hake. 



(1) June 4; a vial with specimens collected from a hake by Dr. F. P. Gorham contained parts 

 of pyloric ca'ca and pieces of gills. On the latter were small cysts not identifiable, apparently very 

 young encysted distoma. One small distomum in the vial. A few immature nematodes obtained from 

 the pyloric ca-ca. I refer the distonmm to I>. ocrcatum Molin provisionally. See below. 



(2) July 30; one, young; stomach empty. Fish had died in an aquarium. No parasites found. 



(3) August 29; one; stomach contained fragments of fish. Larval cestodes in intestine; numerous 

 cysts (Rhynchobothrium) on mesentery and in walls of stomach; small distoma of two kinds found in 

 dish into which contents of intestine had been washed. 



Distomum (Apoblema) ocreatiim Molin. See page 298 for further details. 

 Distomum viiellofsiim sp. nov. See page 290 for description. 



