BIOLOGICAL, SURVEY OE WOODS HOLE AND VICINITY. 
641 
Chondr acanthus phycidis Rathbun. 
R. Rathbun, 1886, p. 320 (sp. nov.); M. J. Rath- 
bun, 1905, p. 101. 
From gills of Urophycis tenuis, taken “off 
Marthas Vineyard,” 15 specimens, taken on 
one occasion only (perhaps far beyond the 
limits of the region). 
Family Caugid^. 
Caligus belones Kroyer. 
C. B. Wilson, 1905a, p. 586; M. J. Rathbun, 1905, 
p. 91. 
From external surface of a fish in the Woods 
Hole collection, labeled ‘‘ Coryphaenaequisetis” 
[probably C. hip purus ] ; place of capture un- 
certain. — Wilson. 
Caligus bonilo Wilson. 
C. B. Wilson, 1905a, p. 589 (sp. nov.); M. J. Rath- 
bun, 1905, p. 89. 
First obtained at Woods Hole, in summer of 
1883, by R. Rathbun, who never published 
a description. Found in the mouth and gill 
cavity of Sarda sarda, as many as 100 having 
been taken from a single fish. 
Larvae may be raised in August through three or 
four successive molts; a typical metanauplius 
and chalimus. — Wilson (MS.). 
Caligus chelifer Wilson. 
C. B. Wilson, 1905a, p. 582 (sp. nov.); M. J. 
Rathbun, 1905, p. 91. 
Hosts: Brevoortia tyrannus, Trichiurus lepturus, 
Xiphias gladius; external surface, rare. 
Female specimens only known; breeds in July 
and August. 
Caligus curtus Muller. 
Verrill and Smith, 1873, p. 575, 459 (no local 
records); R. Rathbun, 1884a, p. 486 (no local 
records); C. B. Wilson, 1905a, p. 578; M. T. 
Rathbun, 1905, p. 90. 
Hosts: Gadus callarias, Iiippoglossus hippoglos- 
sus, Melanogrammus oeglefinus, Pollachius 
virens, Raja Icevis, Urophycis tenuis; very 
common on external surface and probably a 
serious menace to the life of the fish; rarely 
found in gill cavity. — Wilso 1 (MS.). 
Breeds from May to September; a typical nau- 
plius occurs, colored with dark brown pig- 
ment; chalimus may be found on cod in late 
July or early August. — Wilson (MS.). 
Caligus mutabilis Wilson. 
C. B. Wilson, 1905a, 573 (sp. nov.); M. J. Rath- 
bun, 1905, p. 90. 
Hosts: Centropristes striatus; also one specimen 
each from Pollachius virens and Sarda sarda; 
found inside the mouth, fairly common. 
Breeds in July. — Wilson (MS.). 
Caligus pelamydis Kroyer. 
C. B. Wilson, 1905a, p. 594. 
Host: Sarda sarda; found in the gill cavity in 
company with Caligus bonito; rare and only 
the females known. — Wilson. 
Caligus rapax Milne Edwards. 
Verrill and Smith, 1873, p. 575, 457; R. Rath- 
bun, 1884a, p. 487; C. B. Wilson, 1905a, p. 
568; M. J. Rathbun, 1905, p. 89. 
Hosts: Acipenser sturio, Alosa sapidissima, Am- 
modytes americanus, Carangus crysos, Carcliarias 
littoralis, Cyclopterus lumpus ; Dasyatis centrum, 
Gadus callarias , Kyphosus sectatrix, Melanogram- 
mus ceglefinus, Menticirrhus saxatilis, Mona- 
canthus hispidus, Paralichthys oblongus, Polla- 
chius virens , Pomolobus pseudoharengus , Pseudo- 
pleuronectes americanus, Raja erinacea, Raja 
Icevis, Raja ocellata, Remora remora, Roccus 
lineatus, Scomber scombrus, Squalus acanthias, 
Stenotomus chrysops, Trichiurus lepturus, 
Urophycis chuss, Urophycis tenuis, Xiphias 
gladius. Always an external parasite, often 
being sufficiently numerous to seriously 
injure the host. Frequently taken in tow. 
Breeds from April to October. — Wilson (MS.). 
Caligus rufimaculatus Wilson. 
C. B. Wilson, 1905a, p. 561 (sp. nov.); M. J. 
Rathbun, 1905, p. 89. 
Hosts: Fundulus heteroclitus, F . majalis, Mugil 
cephalus, on external surface; also taken in 
tow net. 
Breeds from June to September; chalimus stage 
found upon the host late in June or early in 
July. 
Caligus schistonyx Wilson. 
C. B. Wilson, 1905a, p. 564 (sp. nov.); M. J. 
Rathbun, 1905, p. 89. 
Hosts: Brevoortia tyrannus (common), Poma- 
tomus saltatrix (rare); external, also often 
taken in tow. 
Breeds in late August or early September. — 
Wilson (MS.). 
