166 
SCANDINAVIAN FISHES. 
Icelus hamatus , Kkoyer, Naturh. Tidskr. Kbhvn, ser. 2, vol. 1, 
pp. 253 et 262; Id., Voy. Scand. etc. (Gaim.) tab. I, fig. 2. 
Malmgr., Ofvers. Vet.-Akad. Forh. 1864, p. 507; Esm., 
Forh. Skand. Naturf. M. Christ. 1868, p. 518; Coll., Vid. 
Selsk. Forh. Christ. 1874, Tilleegsh., p. 35; Lticn, Vid. 
Meddel. Naturh. For. Kbhvn 1876, p. 380; Gthr, Proc. 
Zool. Soc. Lond., 1877, p. 293; Coll., Vid. Selsk. Forh. 
Christ. 1879, No. 1, p. 14; Id., Norsk. Nordh. Exp ., Zool ., 
Fiske , p. 34. tab. I, fig. 8; Lillj., 6'v., Norg. Fislc., vol. 
I, p. 164; Bean, Bull. U. S. Nat. Mus., No. 15, p. 128; 
Jord., Gilb., ibid., No. 16, p. 691; Coll., N. Mag. Naturv. 
Christ., vol. 29 (1884), p. 56. 
Icelus furciger , Malm, Forh. Skand. Naturf. M. Stockh. 1865, 
p. 410; Gigs , Boh. Fn., p. 393. 
Ohs. Though Reinhardt states that the number of branchio- 
stegal rays in Cottus bicornis is 7, still from the rest of his brief 
remarks on the species it seems highly probable, as Malmgren has 
already asserted, that this species is identical with Kroyer’s Icelus 
hamatus , especially as a variation from 6 to 7 in the number of the 
branclriostegal rays, though not observed in any other case in this 
species, is fairly common in the following genus. 
Centridermichthys hamatus is a fairly common spe- 
cies in Spitsbergen, where it has been found in most 
of the places examined by the Swedish expeditions, 
among the algae and on a stony, sandy or clayey bot- 
tom, at a depth of from 6 to 80 fathoms. During the 
Norwegian Arctic Expedition it was taken off Jan- 
Mayen Island at a depth of 95 fathoms. On the coast- 
of Greenland the species seems to be equally common; 
and the largest specimen known, a female 115 mm. in 
length, is mentioned by Lutkkn as taken there. During 
the “Sophia” Expedition of 1883 it was taken on a 
clayey bottom, at a depth of from 10 to 20 fathoms, 
north of Cape York; and according to Gunther it is 
one of the most common fishes in these regions between 
latitudes 80° and 82° N. According to Jordan and 
Gilbert it occurs on the coast of Alaska; and the Vega- 
Expedition obtained specimens from the coast of Siberia- 
west. of Taimyr Peninsula. It is thus a. circumpolar 
species, but roves south in the Atlantic as far as the 
Skager Rack, where a specimen 52 mm. in length was 
taken by A. W. Malm in 1861, at a depth of less 
than 20 fathoms, off Loken at- the entrance of Gullmar 
Fjord. Its food is probably the same as that of the 
preceding species: we have found in its stomach num- 
bers of the bristles of Annelidans. 
Genus TRIGLOPS. 
Two distinct dorsal fins. Lateral line covered with scales , ivhich are dentated at the upper margin of the opening 
ducts; a row of spinous plates along each side of the dorsal fins; the rest of the skin naked, verrucose {on the 
head and above the lateral line) or gathered into oblique, transverse folds, fringed or dentated at the margin {on 
the sides below the lateral line). Head middle-sized and, like the anterior part of the body, posteriorly elevated 
and compressed. Four simple spines in the margin of the preoperculum. Jaws and the head of the vomer with 
teeth, but the palatine bones toothless. Branchiostegal membranes inferiorly united, but free from the isthmus. 
Gill-slit behind the fourth branchial arch shrunk into a hole. Urogenital papilla of the male long. Bays in the 
anal fin more than 20. 
The genus Triglops was first introduced into the 
system in 1832 by Reinhardt®, as a- subgenus of Cottus, 
on account of the smaller size of the head; the nar- 
rower pect-ora-l fins with their loiver rays free to a 
greater extent; the greater breadth of the preorbital 
bone; and the large number of rays in the posterior 
dorsal and the anal fins. As a genus, however, its 
characters were more fully given first by Kroyer, in 
1845. It contains only one known species, named after 
the explorer of Greenland, Dr. Pingel, who in 1829 
obtained the first specimen known. 
Dansk. Vid. Selsk. Naturv. Math. Afh., 5:te Deel Overs, p. LII. 
