Notes on Luvarus imperialis Raf., a fish new to the fauna of Norway. 7 
in caudal direction’). (Text-fig. 1). This side keel probably serves for 
the purpose of balancing. 
The ventral fin is reduced to only one strong spinous ray, 
of unusual shape; in section it is triangular, having the largest 
plane outwards. The two ventral spines meet and converge into 
each other, thus becoming one, which falls into a groove on the 
body and corresponds to its contour. The anus is situated at the 
hinder part of this groove. The joint breadth of both the ventrals 
is 1 cm. at the base, 1,6 cm. at the broadest part; the one is 3, the 
øker 2,5 cm. in length. (PL 1, figs. 3 & 4). 
The dorsal has 13 rays, the last of them being divided into 
two down to the base; the others are undivided, unarticulated, 
drawn out at the ends into fine, soft points. In front of the dorsal 
fin and without any connection with it, there are still two other ravs, 
separated about 3,5 cm. from each other. The front one is 1,8 cm. 
in length, the other, which ends in a fine thread, is 3 cm. long. 
These two rays have no fin membrane, they lie in a groove and 
cannot be raised by the fish, being covered over by the skin of its 
body. They form a part of the sharp edge of the contour of the 
back, and can only be raised by force into a somewhat slanting 
position, the hinder one the more slanting of the two. Evidently 
we here have remains of that part of the dorsal fin which, at earlier 
stages, reached right away to the head. (More about this later). 
The anal has 14 rays similar to those of the dorsal fin. 
Three centimeters in front of A, there is a ray measuring 2 cm., 
which is reclined in a groove on the body. There is a larger number 
of rays also in the anal fin in younger specimens. 
The caudal lobes are almost perpendicular to the lon- 
gitudinal axis of the body; each appears to have about eleven 
rays which go together into the lobe; the connecting part between 
the two lobes is thick and cartilaginous; no rays were discernible 
here when the fish was fresh, but, after being kept in spirits, the 
structure showed itself as depicted on PI. I, fig. 1. The height of 
the caudal is the same as that of the body viz. 30 cm. 
*) There is no question that this can be a post-mortem impression of 
the fin; the ventral edge is on both sides of the body and is strongest just 
where the rays are weakest (the ventral rays), furthermore, the fin in its post- 
mortem position fell dorsal to the edge. 
