Notes on Luvarus imperialis Raf., a fish new to the fauna of Norway. 5 
free portion of the tail, which is very short, is a little more than "/, of 
the whole length of the body, and is depressed; this appearance is 
heightened by the longitudinal keel, which is placed on either side 
oi the caudal peduncle; the length of this side keel is 6.3, breadth 
1,7 cm.; behind these on the caudal root are two very low keels 2 cm. 
long, one on either side of the side keel and slightly convergent 
towards the tail (similar to Thynnus). 
The greatest height of the body is nearly midway between tip 
of snout and root of caudal. The ventral outline is an even curve 
from mouth to root of tail, the dorsal outline in the hinder half .s 
symmetrical to the ventral; from the dorsal fin and towards the 
| front, where it is supported by a hard edge, 
it is not so arched, until, just above the eye, 
it declines sharply downwards to the mouth. 
Head. The shape of the head is very 
peculiar, its height being greater than its 
length. The upper end of the mouth, eye 
& gill-cleft are all on the same level, but 
on account of the difference in the dorsal 
and ventral contour, the dorsal half of the 
head is more powerful than the ventral. 
From the upper end of the gill-cleft, there 
is a ridge which stretches forward a little 
above the eye, dividing the head into two 
halves; from the eye forward this ridge is 
Fig. 1. L. imperialis. especially prominent, and dorsally to it there 
Vertical section through is a groove above which the head diminishes 
the body at the base of abruptly in thickness and assumes a pointed 
pectorals. ("/snat.size). bowshape. If one looks at the head from 
the front and a little sideways, it will be seen that the outline will 
change from convex dorsally to concave with the deepest part there 
where the groove is situated, again reaching its greatest height at 
the upper jaw, and then becoming normally convex. 
The lateral line. The superior lateral line takes its 
beginning on the head, a little in front of the gill-cleft, nearly 
vertical to the.eye, and continues in an irregular curve backwards 
running about halfway between the contour of the back and the 
pectoral fin; it ends below D, ,%; the inferior lateral line 
1) The figures denote the number of the fin rays. 
