280 Prof. R, Collett u7i the Occurrence 



In C. glacialis the gloss on these portions is green, but on 

 the lowest portion o£ the large broad collar (nearest to the 

 white breast) the gloss in C. glacialis is also bluish. 



The crown of the head is of about the same hue in both 

 species. The female, brought home by the ' Vega^ Expedition, 

 snot on the nest (at Pitlekai, Tschuktschi-land, July 10th, 

 1879) had also, according to Nordquist^, traces of green on 

 the crown. 



Habits. — But little information concerning the habits of 

 C. adamsi has been obtained on the Norwegian coasts. Some 

 of the specimens were caught in nets, in which they had been 

 entangled when diving. The largest male in the University 

 Museum of Christiauia, from the Porsanger Ijord (Nov. 

 1893), was taken on a hook which was laid at a depth of 

 about 15 fathoms. 



In the specimens that I have dissected the stomach was filled 

 with remains of fishes, and had a quantity of gravel in it. 

 The last specimen received (from Porsanger in Finmark, 

 Dec. 20th, 1893) contained an example of Cottus scorpius 

 (total length 270 mm., a full-grown female filled with roe). 



It deserves to be mentioned that, except in the breeding- 

 season, the organs of generation of C. adamsi f are remark- 

 ably small. I have always found the left testis in the male 

 larger than the right ; the latter in the young males is occa- 

 sionally almost thread-like and interrupted J. 



List of Specimens and Measurements. 

 A. Young, first autumn and winter. 

 No. 1, Tromsci. Tromso Museum. 



No. 2. Flekkefjord, 10th Dec, 1879. Christiania Museum. 



* Palmen, ' Vega' Exped. Results, v. p. 404. 



t. As in the other species of this family. 



X Concerning the breeding-habits of this Diver there is probably but 

 one observation from tlie Old World yet recorded. This was made 

 during the voyage of the 'Vega.' On the 3rd of July 1879, at Pitlekai, 

 on the Tschuktschi Peninsula, Palander found one egg near a swamp, and 

 shot the breeding female. The length of the egg was 94 mm., breadth 

 •5r)-5 mm., weight lo'ijO grammes (Palmen, ' Vega ' Exped. Results, v. 

 p. 40.3). 



