46 



On tlie front of the female genitalia, the labia majora exhibit 

 a brownisii j)atfh. The white colour on the inferior surface of 

 the tail fin is more developed and extends farther than in the 

 previously described embryos. It may be noticed with regard 

 to tlie character of the colour in these half-developed foetuses 

 (of which the Bergen Museum contains several), that the colour 

 is almost blue-black with changes t(j brownish and grey tints, 

 while the unpigmented skin-colour is yellowish with a tinge of 

 red. The isthmus between the hind lobe of the white trefoil 

 and the white colour of the abdomen is very narrow in places. 

 The umbilical cord is also darkly pigmented, the pigment 

 beginning at a distance of V2 centim. from the insertion. 



In fætuses of this stage of developement, the incipient 

 dental series appears like a crenulated fillet, beconung 

 narrower in front and behind: 10 prominences may be counted 

 on each side. The number of the fietal hairs varies between 

 4 and 6. The eye region generally forms a slight convexity. 



Two larger embryos, respectively 1.870 metres and 2.080 

 metres in length were acquired by the Bergen Museum in 

 Nov. 1887 from a catch on Bildoen. The curator, Grieg, has 

 furnished measurements of them (cf. Annual Eeport of the 

 Bergen Museum, No. 4, 1889). These embryos I classify as 

 "almost full-grown." 



Fig. 3. Orca gladiatiir, a tViimle fætus H75 iiiillim. Iniif; 



1\. A young Orca. In Jan. 1891, the Christiania 

 University Museum ol)tained a young female Orca, 2.."il 

 metres in length, of which an illustration will be found on 

 PI. Y, fig. 2. The skin has been stuffed and placed in the 

 Zoological Museum, the skeleton in the Zootomic Collection. 

 The dimensions of the animal were as follows: — 

 Total length, in a straiglit line from the point of the snout 



to the tail cleft 2. .5 1 metres 



Length from the point of the snout to the extreme 



point of the tail lobe 2. .54 ,. 



Circumference behind the pectorals 1.21 ,, 



Length of pectorals 0.28 ,, 



Breadth of do 0.16 „ 



Height of dorsal fin 0.19 



Breadth of do. at base 0.25 „ 



Breadth of tail fin O..0.") ,. 



On considering the uninjured animal, one is struck by 

 the elegant form of the body, which still seems somewhat 

 more slender than in the fall-grown animal. The snout rather 

 calls to mind the dolphin's "beak'', for in the line of contour 

 of the upper jaw. there is a slight concavity a little above 

 the point of the snout 'see PI. V, fig. 2). 



The pectorals are -of tlie characteristic leaf-like form; 

 their length amounts to nearly ^4 of the length of the 

 body (in the older female, they amount to '/s, in the older male, 

 from '/ti to 'V,- according to Lilljeliorg. lit. 72). 



