550 
SCANDINAVIAN FISHES. 
THE THREE-BEARDED ROCKLING ( SW. TRETOMMADE SKARLANGAN). 
ONOS TRICIRRATUS. 
Fig. 131. 
Only three barbels: one at each anterior nostril and one under the chin. Length of the head in adult specimens 
20 — 22fi 2 % of that of the body. Longitudinal diameter of the eyes in full-grown specimens less than 30 % of 
the postorbital length of the head , this length being greater than the distance between the tip of the snout and the 
hind extremity of the maxillary bones , and also (as a rule) than the length of the lower jaw, which is more than 
half the length of the head. Least depth of the tail more than 6 % of the length of the body , than 1 / 2 the base 
of the first dorsal fin, than 19 % of the distance between the second dorsal fin and the tip of the snout, or than 
45 % of the depth of the body at the beginning of the anal fin. Base of the first dorsal fin less than 2 / 3 , its 
first ray less than l / i , of the distance between it and the tip of the snout. 
Fig. 131. Onos tricirratus from the island-belt of Gothenburg, 2‘2nd Nov., 1886. 1 /. 1 the natural size. Specimen in the possession 
of Gothenburg Museum. 
R. hr. 7; D. (55) 58—60 (64)°; A. (45) 47—49 (54) 6 ; 
P. 19 — 21°; V. 7 rf ; C. 30; Vert. 48— 49 e . 
S'yn. Mustelce varietas, Willughby, Hist. Pise., p. 121; Modeling-, 
Mustela marina vulgaris (1), Jago apud Raium, Bynops. Pise., 
p. 164, fig. 9; Three Bearded Cod, Penn., Brit. Zool. (1776), 
tom. Ill, p. 176, tab. XXXIII, No. 87. 
Gadus tricirratus (p. p.), Brunn., Ichthyol. Massil., p. 22; 
Donovan, Nat. Hist. Brit. Fish., vol. I, tab. II; Flmng, 
Brit. Anim., p. 193; Nilss. ( Motella ), Prodr. Idith. Scand., 
p. 48; Skand. Fa., Fisk., 586; Gthe (p. p. + M. maculata, 
p. p.), Cat. Brit. Mas., Fish., vol. IV, pp. 365 et 366; 
Oi.sson, Ofvers. Vet.-Akad. Forh. 1867, p. 650: Coll., Yid. 
Selsk. Forh. Christ. 1874, Tillaegsh., p. 121; Mor., Hist. 
Nat. Poiss. Fr., tom. Ill, p. 268; Day, Fish. Gt. Brit., 
Irel. , vol. I, p. 317, tab. LXXXVIII, fig. 1. 
Gadus argenteolus, Montagu, Mem. Weru. Soc., vol. II, p. 449; 
Yarr. (Motella), Brit. Fish., ed. 2, vol. II, p. 283; Gthr 
(Concilia argentata), Cat. Brit. Mus., Fish., vol. IV, p. 363; 
Day (1. c.), tab. LXXXIX, fig. 3. 
Gadus Mustella , Risso, Tchtli. Nice, p. 120; Id. (Onos), Fur. 
Mer., tom. Ill, p. 215. 
Motella vulgaris, Yarr., Brit. Fish., ed. 1, vol. II, p. 186; 
ed. 2, vol. II, p. 270; Steind. (p. p.), Stzber. Akad. Wiss ? 
Wien, Math. Naturw. Cl. LVII, i (1868), p. 710; Lute.. 
Yid. Meddel. Naturh. For. Kblivn 1881, p. 235; Coll. (Onos), 
N. Mag. Naturv. Christ., Bd. 29 (1884), p. 87. 
Motella quadricornis, Kr. mpt., Lute., 1. c., pp. 245 — 246. 
Onos maculatus, Lillj., Sv., Norg. Fisk., vol. II, p. 164. 
Obs. Brunnich, it is true, has not given a description of this 
species definite enough to enable us to decide with any certainty 
according to Day. 
« 55—57, 
62 — 64, 
50 — 60, 
b 51—54, 
45—50, 
,, Lutken. 
,, Moreau. 
,, Lutken. 
,, Moreau. 
c 21 — 22, ,, ,, Lutken. 
16—18, „ „ Day. 
d Sometimes 8, according to Lutken. 
c According to GOnther. 
