302 
SCANDINAVIAN FISHES. 
THE BIMACULATED SUCKER. 
LE PA DOG ASTER BIM ACULATUS. 
Fig. 75. 
Dorsal and anal fins distinctly separated f rom the caudal fin, the first containing at most 7 rays and the anal 
fin 6. Breadth of the snout just in front of the eyes greater than its length, ivhicli is about equal to the breadth of 
the interorbital space, to the length of the base of the dorsal or anal fin ( the difference usually being only slight), 
or to the distance between the dorsal and caudal fins. Two nostrils on each side , within the line from the upper an- 
terior corner of the eye, the posterior with a small nuciferous pore beside it, the anterior alone with a slightly 
raised, tubular margin, but without any lobate appendage. Longitudinal diameter of the eye in small specimens 
{about 30 mm. long) 2 / 3 or more of the breadth of the interorbital space, in large specimens ( over 50 mm. long) 
v 2 or less thereof. Longitudinal diameter of the entire adhesive disk about 18 — 21 % of the length of the body: 
pelvic disk (- within the ventral fins) short and round: postclavicular disk trapezoidal, broadest behind. Length of 
the head from about x / 4 to 1 / 3 a , greatest depth of the body from about 1 / 9 to 1 /f, least depth of the tail about 
] / 12 c , and the length of the caudal fin from about Vs to 2 / ls d , of the length of the body. Length of the pectoral fins 
about equal to the greatest depth of the body, the lateral flap of the posterior division of the ventral disk ex- 
tending scarcely half-way up the pectoral fins. 
R. hr. 6; D. G e - .4.4/; P. 211.22?; V. — ; C. x+ 9 I. 10 +*; 
4 
Vert. 29 I. 30. 
iSijn. Bhnaculated sucker, Penn., Brit. Zool. (ed. 1776), torn. Ill, 
p. 345, tab. XXII, App.; Cy diopter us bimaculatus, Donov., 
Brit. Fish., IV, tab. LXXVIII; FleSi. ( Lepadogaster ), Brit. 
Anim., p. 190; Yarr., Brit. Fisli., ed. 2, vol. II, p. 363; 
Dub. et Koren, Vet.-Akad. Handl., 1844, p. 109, tab. Ill, 
fig. 7; Nilss., Skand. Fn., Fisk., p. 241; Gthr, Cat. Brit. 
Mus., Fish., vol. Ill, p. 514; Coll., Forfi. Vid. Selsk. Christ., 
1874, Tillaegsh., p. 90; Mor., Hist. Nat. Poiss. Fr., tom. 
a From 25'6 to 30‘3 % of the length of the body, according to Canestrini. In specimens from Norway, of an average length of 
SOY mm., the length of the head is on an average 2 9 " 6 % of that of the body. 
6 From 1 1 ‘ 6 to 15 % of the length of the body, according to Canestrini. In the Norwegian specimens just mentioned the average 
is 1 2 ’ 7 % of the length of the body. 
c In the Norwegian specimens just mentioned the average is 8’1 / of the length of the body. 
d From 20'4 to 15’5 % of the length of the body in specimens between 33 and 53 mm. long, according to Canestrini. In the 
Norwegian specimens just mentioned the average is 19 % of the length of the body. 
e Sometimes, though seldom, 5 or 7, according to v. Duben and Koren. 
/ Sometimes, though seldom, 5 or 6, according to v. Duben and Koren. 
y 23 or 24, according to v. Duben and Koren. 
