The fishes of the Danmark Expedition. 671 



specially marked on the flanks of the tail (though not so much as 

 later), the head, and dorsal and lateral parts of the trunk being 

 covered by dark-brown pigment. The ventral aspect was yellowish- 

 silvery and the fins yellowish-white. 



At ca. 80 mm (PI. XLV, fig. 6) the ground-colour differs from the 

 foregoing by being lighter brown on the back and sides, with the 

 result that the dark cross-bands (almost black-green) are all the 

 more marked (this is already the case at ca. 50 mm). The ventral 

 aspect is now more purely silvery and the fins are of a fine, 

 yellowish-red colour, more or less sprinkled wûtli black dots of 

 pigment, which form a dark band on the outer edge of the caudal 

 fin. This colour agrees well in tone with that of the lake-bottom 

 and (in contrast to the colour of the older individuals) is surprisingly 

 durable after the death of the fish or preservation. 



At a size of ca. 100 mm the colour of the fish changes, the dark- 

 brown or blackish-green colour of the back changing to a light-brown 

 with dark cross-bands and a quantity of small, light dots on the 

 sides of the fish. The ground-colour is now silvery-golden, with a 

 blackish-brown layer of pigment over it, darkest on the dorsum 

 and represented on the sides by ca. 10 cross-bands; the latter are 

 mutually connected over the dorsum in pairs. The light-coloured 

 spots on the sides are the ground-colour shining through and they 

 are most numerous and largest round about the lateral line. The 

 ground-colour of the dorsum is light earthy brow^n; and on regarding 

 the fish from above, this colour is seen in the form of two oval 

 spots in the occipital region and as a larger, broad streak (largest 

 in front and rounded in form), which extends from above the 

 pectorals to D^ ; the connections of the cross-bands are seen in it. 

 The gill-cover has a strong golden sheen and the black-brown 

 pigment of the head covers especially the region behind the preoper- 

 culum and below the eye, where it is connected with the dark snout. 

 The posterior margin of the maxillary is strongly pigmented and a 

 little, scattered, black pigment is present in the cavity of the mouth. 

 The ventral aspect from the tip of the under-jaw (which has a little 

 pigment) to the anus is quite white. The iris is silvery with brownish- 

 black pigment, the pupil black. The peritoneum is light-yellow. Of 

 the fins P, D^ and D- have black pigment (the first however only 

 from a little in front of the middle and the uppermost ray); the 

 other two gray with black outer margin. С has black pigment 

 especially round about the base and the rays as well as along the 

 outer margin. V and A only have a little black pigment along the 

 rays. C, P and V have an orange-red ground-colour (on С however 

 only to be seen as tw^, broad streaks on the outermost rays); P 



