242 LILLJEBORG ON THE 



Delfhinus ALBICAN'S, O. Fubricius. Fauna Groeulandica, p. 50, 178(1. 



Delphinapteiius beluga, Lacépcde. L. c, p. 213. 



Delphinus leucas, G. Cuvier. Reclierches sur les Osscmcns Fossiles, t. v. 1" partie, 



p. 287, tab. xxii, figs. 5 and 6. 

 Phocæna — F. Cuvier. L. c, p. 199, tab. xv, fig. 1 ; tab. xvi, figs. 1 — 3. 

 Beluga catodon, J. E. Gray. L. c, p. 29. 

 Delphinus leucas, S. Nilsson. L. c, p. 614. 



Length of body 12' — 18', or more. It is robust and thick, more so than the " lesser killer," 

 Its greatest circumference, which is equal to about § its length, somewhat before the middle of 

 the body. Pore part of body less tapering, and ending obtusely, as the front of the head is 

 almost perpendicular from above down to the somewhat projecting border of the snout or upper 

 lip ; above this, which is limited behind by a shght notch, it is rounded and convex anteriorly, 

 and when viewed from above somewhat tapering forward. The upper margin of the head, viewed 

 from the side, slopes somewhat at the blowers, and is almost straight before this point, until it 

 suddenly inclines at the forward convexity. The lower edge of the chin is somewhat raised and 

 arcuate. The transverse, crescent-like opening of the blowers is somewhat further back than the 

 eyes. The body tapers very much backwards, particularly when viewed from" above, and is 

 considerably compressed from the caudal fin to a tolerable distance forward, with the upper and 

 lower edges rather sharp, and extending backwards between the two lobes of the caudal fin. The 

 hinder part of the body or the tail is, when seen from the side, much higher than the thickness 

 of the caudal fin, and its lower margin rises considerably towards the caudal fin, while the upper 

 margin is almost straight. There is, on the middle of the back, as a rudiment of a dorsal fin, a 

 longitudinal, rough, compressed protuberance, about 18" long, formed by the skin, on which the 

 epidermis is much harder than elsewhere. The pectoral fins are in their usual position, and are 

 small, short, and blunt, having an obtuse angle in the middle of their hinder edge. The caudal 

 fin is of the usual shape, deeply forked in its hinder edge. The small eyes are directly behind, 

 and very near to, the angles of the mouth.^ The pectoral fins were 14" long and 8|" wide in the 

 specimen mentioned in the note below, which was a female about lOi' in length, the caudal fin 

 2' 3" wide between the points, the tail G~" before the caudal fin, was 9^" high, and Sj" in breadth. 

 The head was 13|" high and 12|" broad, measured across the eyes. The colour was, accord- 

 ing to Mr. Quennerstedt,^ shining milk-white, with a narrow, blackish-blue edge on the pectoral 

 and caudal fins. The old ones are, according to Pallas, white as ivory, and the young at first 

 greyish-brown. 



I have made the following observations from a skeleton, about 12' long, from Spitzbergen : — • 

 Skull 22i" long and 12^" wide across the temporal bones. Nose 10^ long and 7|" wide at the base. 

 Lower jaw 16|" long, and its teeth-line 0^" long. The nasal and frontal bones form a tubercle, 

 rising rather prominently behind the blowers. Crista lambdoidca low, and directed backwards. 



■* The head, the hind part of the body and the fins, are here described from a salted skin from 

 Greenland, of which the head, the hind part, and the fore extremities, were uninjured. It is now- 

 stuffed, and the natural form of these parts has been preserved. It is preserved in the Zoological 

 Museum of this University. 



- ' Auteckningar om Spitzbergen' (manuscript). 



