38 



EINAR I.ONNBERG, 



(Schwed. Sudpolar-Exp. 



always exceeding the length of the snout, sometimes equal to snout and eye together 

 (in Ch. esox the longest rays of first dorsal are much shorter than snout). Anterior 

 long rays of second dorsal also, as a rule, at least equal to, usually exceeding the 

 snout in length (in CIi. esox the}' are much shorter than snout). Lower lateral line 

 short, so that its length usually is contained four times or more in the distance be- 

 tween caudal and eye (in CIi. esox about three times). Depth of caudal peduncle 

 not contained twice its length (in Ch. esox about thrice). 



The colour of C/iaiiipsocef/iali/s gunnari does not appear to be so bright as in 

 Ch. esox. It is in spirit dark leaden grey with some broad transverse black bands. 

 Dorsal fins black, the others seem to have been more or less dusky, somewhat dif- 

 ferent in different specimens; at least the end of the caudal is black. 



Total length with caudal in mm. . . 



Length of head measured to the end 

 of the opercular spine in ^ of tot. 1. 



Postorbital length of head > » » . > 



Diameter of eye . . 



Length of snout . . 



Interorbital width 



Length of maxillarj- 



Distance from snout to 



first dorsal 



Distance from snout to 

 base of ventrals . 



Length of pectoral . 



> Ï ventral . 



Depth of body . . 



Least depth of body 



Champsocefhalus giinnori. 



Ch. es 0.x * 

 average of 



3 sp. I 4 sp. 



322 



28,2 

 10,9 



6,1 

 11,8 



7,8 

 13.4 



25. 



27,0 

 20,2 

 18,0 

 12,7 



3-7 



340 



27,4 

 10,6 



5-3 



11,5 



7,3 



13,^ 



25,0 



25,3 

 18,8 



16,2 



135 



4-3 



390 



26,7 



10,5 



5,4 



11,3 



7,2 

 12,8 



25-4 

 25,- 



393 400 



27,7 

 11,2 



5,6 



ii.s 



8,0 



12,7 

 24,8 



23,9 



17,4 19,1 



15.4 

 14,0 



3.6 



15,° 

 15,2 



3-9 



26,8 

 10,3 



5,3 



411 



26,3 



10,5 



5-" 



ii,s 11.2 

 7.9 7,4 



13-3 

 25,5 

 24,3 



12,7 

 24,3 

 25, 



19,0 19,7 



17,3 



'5,5 



4,1 



15,3 



3,7 



267,7 

 29,0 



11,3 

 4-5 



13,3 

 6,3 



16.0 



28s, 



28, 



10,7 

 4,4 

 13.2 



6 

 15,9 



27,9; 26,9 



24,9 

 16,0 

 14,8 

 12,9 



3,7 



25,7 

 15,8 



■5,5 



12,4 



3 À 



The differences between the two species Chanipsocephalus gunnari and Cli. esox 

 appear to stand in correspondence with their habits and occurrence. The latter whicli 

 lives in shallower water and among vegetation has brighter colours, with numerous 

 spots and transverse bars etc. which pattern evidently makes it less conspicuous in 

 such surroundings. Ch. gutifiari again seems to live in somewhat greater depth than 

 its relative. It has therefore assumed more sombre colours and acquired larger eyes 

 to facilitate the discovery of its prey. The greater fins indicate probably that it 

 keeps itself suspended in mid water. 



* The measurements of Ch. esox chiefly after F. .-\. Smitt: «Poissons de l'expédition à la Terre de 

 feu sous la direction du Docteur O. Nordenskiold ». Bih. K. Vet.-.\kad. Handl. Bd. 24. Stockholm 1898. 



