SCANDINAVIAN CETACEA. 225 



Thirty or forty species of this genus have been described, only four of which belong to the 

 Scandinavian Fauna. 



1. D.DejjPUis, Zinne. Dolphin. JSwedis/i " SipYir\Qaxe." 



On the shdl, on the lower side of the superior maxillary, inside of each row of teeth, there is 

 a longitudinal fossa extending about two thirds the length of the row of teeth. 



Delphinus delphis, G. Cuvier. Recherches sur les Ossemens Fossiles, 3me edit., 

 t. V, part 1, pp. 275 and 303, tab. xxi, figs. 9 and 10, 1825. 



— — F. Cuvier. Histoire Nat. des Cétacées, p. 123, tab. ix, figs. 



4 and 5, 1836. 



— — J. E. Gray. Zoology of the Voyage of tbe Erebus and Terror, 



Mammalia, p. 40, 1846. 



— — S. Nilsson. Skandinavisk Fauna, Daggdjuren, 2 : a Uppl., 



p. 591, 1847. 



Length 6' — 8'.^ Body, fish shaped, rather robust, thickest about the middle, and most 

 tapering towards the caudal fin, in front of which it is strongly compressed. Nose limited behind 

 by a conspicuous indentation, in front of which it is rather depressed, and more elongated and 

 pointed than in any other of our indigenous species of the same genus. Dorsal fin somewhat 

 behind the middle of the body. 



I have taken the following notes from a specimen, caught in Christiania Bay, now 

 stuffed and preserved in the Zoological Museum of the University of Christiania : — Length 6' 1,". 

 Nose 4i" long from the notch. Dorsal fin ISf along the anterior edge from base to point. 

 Pectoral fins 12" long. Distance between the points of the caudal fin 14." Colour: — The nose 

 and head above, the back, pectoral fins, caudal fin, and hinder part of body in front of this, a 

 streak from the pectoral fins to the chin, another from the caudal fin to the sides of the body under 

 the hinder part of the dorsal fin, and the parts around the eyes, black. The rest of the sides, the 

 lower jaw, and the belly, white. A white streak runs forward above the angle of the mouth, 

 under the black spot about the eyes. 



I have taken the following measurements from an indigenous skull in the same museum : — 

 Length of skull 1' 51"; its width across the processus zygomatici of frontal bone 7l". Length of 

 nose, from the notch on the superior maxilla, 10|" and its width at the base, 3|". The shortest 

 distance between the lateral edges of pars occipitalis 5^". Length of lower jaw 14|". Ossa 

 intermaxillaria rising considerably in the middle, with sides almost vertical. The right one 

 extends farther back than the left one, somewhat behind the posterior edge of the vomer. The 

 triangular area on these bones pointed, and concave before the blowers, with somewhat projecting 

 side edges. Both the longitudinal fossæ on the lower side of the upper jaw-bone extend to about 

 2^" from the point of the snout. Teeth ||I|| ; five of them in the middle of the upper jaw occufoy a 

 space of jl". The row of teeth in the lower jaw is somewhat shorter than Irds of the length of the bone. 



^ The measurements in this memoir are, unless otherwise stated, given in Swedish feet and 

 inches, one of which is equal to 0'9742 of the corresponding English measure. 



29 



