594 
BULLETIN OF THE BUREAU OF FISHERIES. 
Nectonema agile Verrill. 
Verrill and Smith, 1873, p. 453 (a “ slender round 
worm”); Verrill, 1879, p. 187 ( Nectonema 
agilis, sp. now; assigned doubtfully to the 
Nematoda); Ward, 1892; Bumpus, 1898b. 
Vineyard Sound. — Verrill, F. R. Lillie. Woods 
Hole. — Woodworth, Andrews. Newport. — A. 
Agassiz, Fewkes. 
Swims actively at the surface in the evening in 
June and July. Ward regards the body 
structure as indicating that this worm is a para- 
site during its larval life. 
Pontonema marinum Leidy. 
Verrill and Smith, 1873, p. 634, 325, etc. 
Vineyard Sound, “very abundant from above 
low-water mark to 10 fathoms;” rocky shores, 
beneath stones, among algae, hydroids, etc.; 
adults taken in surface tow, in February. 
Pontonema vacillation Leidy. 
Verrill and Smith, 1873, p. 634, 326. 
Occurrence similar to that of P. marinum. 
Spiroptera pectinifer Linton. 
Linton, 1901, p. 411, 427 (sp. now). 
From stomach of Sphyrna zygcena. 
Class ACANTHOCEPHALA. 
Eckinorhynchus acus Rudolphi. 
Linton, 1889, p. 492; Linton, 1891, p. 525; Lin- 
ton, 1901, p. 409, etc. 
Hosts: Alosa sapidissima, Carcharias littoralis 
(spiral valve), Cynoscion regalis, Enchelyopus 
cimbrius (intestine), Fundulus diaphanus , Fun - 
dulus heteroclitus , Gadus callarias , Hemitripterus 
americanus , Hippoglossus hippoglossus , Lepto- 
cephalus conger (intestine), Limandaferruginea 
(intestine), Lophius piscatorius (intestine), 
Lophopsetta maculata, Macrourus bairdii, Mela- 
nogrammus ceglefinus, Merluccius bilinearis 
(intestine), Microgradus tomcod, Mola mola 
(gills), Myoxocephalus ceneus, Myoxocephalus 
octodecimspinosus , Opsanus tau (intestine), 
Paralichihys dentatus (intestine), Paralichthys 
oblongus (intestine), Pholis gunnellus, Pol- 
lachius virens, Pomolobus cestivalis, Pomolobus 
mediocris, Pomolobus pseudoharengus , Porono- 
tus triacanthus , Prionotus carolinus, Prionotus 
strigatus, Pseudo pleuronectes americanus (intes- 
tine), Raja eglanteria, Roccus lineatus, Scomber 
scombrus, Spheroides maculatus (pharynx), 
Stenotomus chrysops (viscera), Tautoga onitis, 
Trichiurus lep turns, Urophycis chuss (intes- 
tine), Urophycis tenuis. 
Eckinorhynchus clavceceps Zeder. 
Linton, 1889, p. 490 ( Eckinorhynchus agilis ); 
Linton, 1891, p. 534 ( E . agilis); Linton, 1901, 
p. 409, etc. ( E . agilis). 
Hosts: Anguilla chrysypa (intestine), Carcha- 
rhinus obscurus (spiral valve), Fundulus hetero- 
clitus, Morone americana (intestine), Opsanus 
tau, Tylosurus marinus (intestine). 
Echinorkynchus attenuatus Linton. 
Linton, 1891, p. 529 (sp. now); Linton, 1900, 
P- 409, 435 - 
Host: Acipenser brevirostrum (=sturio). 
Echinorkynchus carckarice Linton. 
Linton, 1891, p. 536 (sp. now), Linton, 1901, p. 
409, 428. 
Host: Carcharias littoralis. 
Echinorkynchus fusiformis Zeder. 
Linton, 1901, p. 409, 468. 
Host: Opsanus tau (intestine). 
Echinorkynchus globulosus Rudolphi. 
Linton, 1901, p. 409, 435. 
Hosts: Acipenser rubicundus, Anguilla chrysypa. 
Echinorkynchus lateralis Molin. 
Linton, 1891, p. 533 {Eckinorhynchus incrassatus) \ 
Linton, 1901, p. 409, etc. (E. incrassatus) . 
Hosts: Lophius piscatorius, Paralichthys dentatus, 
Pomatomus saltatrix, (in each case from peri- 
toneum). 
Echinorkynchus pristis Rudolphi. 
Linton, 1S91, p. 530; Linton, 1901, p. 409, etc. 
Hosts: Carangus crysos, Cynoscion regalis (vis- 
cera), Lobotes surinamensis (intestine), Lophius 
piscatorius, Palinurichthys perciformis (intes- 
tine), Tylosurus acus. 
Linton (1891, p. 531) lists a variety tenuicornis , 
which he found in “Tylosurus caribbceus” 
(doubtless acus or marinus), and in Lobotes 
surinamensis. 
Eckinorhynchus proteus Westrumb. 
Linton, 1889, p. 496; Linton, 1891, p. 537; 
Linton, 1901, p. 409, etc. 
Hosts: Archosargus probatocephalus (peritone- 
um), Carangus hippos, Centropristes striatus, 
Cynoscion regalis (intestine), Merluccius bili- 
nearis, Paralichthys dentatus (mesentery), Po- 
matomus saltatrix (intestine, usually with head 
perforating the wall), Roccus lineatus (always 
present in rectum). 
