269 



the fry of Gadus virens by the abundant rather equally distri- 

 buted pigmentation, but the latter has (at a similar total length) 

 a very marked longitudinal stripe of closely placed chromato- 

 phores along Ihe middle-line of the side of the tail. The fry 

 of the common cod (Gadus callarias) also looks quite different 

 when of the same size: »The colour is grouped in a charac- 

 teristic way in dark and light spots on the flanks of the trunk 

 so as to form a chequered pattern» ^). Moreover the fry of 

 G. saida is characteristic by the slender form and the large 

 eyes. 



Two post-larval Polar-cods have been caught on Aug. 3'^'^ 

 1891, in Hurry Inlet at the south-coast of Jameson Land just 

 near the beach in very shallow water; they were caught there 

 together with the fry of Cottus quadricornis mentioned p. 237. 



The smaller of them is represented in fig. la&b, plate XI. 

 The length is 13.5 mm. The lower jaw runs steeply upwards 

 and projects in front of the upper jaw when the mouth is shut. 

 The median fin stretches from the back of the neck round the 

 tail and does not stop until just in front of anus. The noto- 

 chord is continued almost to the posterior margin of the fin, 

 and is not yet bent upwards ; rays for the caudal fin are 

 developed a little in front of its end, both above and below. 

 Paired fins have appeared. On each side of the back along the 

 base of the fin-edgings is a pigmented stripe, and a similar one 

 on the middle part of the tail, along each side of the under part, 

 moreover dark chromatophores along part of the middle-line 

 of the side, on the front part of the tail, partly also under the 

 middle-line and along a line which almost corresponds with the 

 upper limit of the abdominal cavity. The upper side of the 

 head behind the eyes is moreover strongly pigmented. 



In the young one which was a little larger, ca. 16 mm. long, 



J) Compare C. G. Joh. Petersen, Fra den danske biologiske Station, XI, 

 1902, p. 7, Fig. 1. 



