231 



coincide. According to Lilljeborg^) the numbers in Swedisli 

 specimens are: D.^ 7—9; D.^ 13—15; A. 14—15; P. 16—17; 

 V. 1 -[- 3 ; in the 16 specimens at my disposal from East- 

 Greenland the numbers are: DM — 9; 0.^13 — 15; A. 13 — 15; 

 P. (15) 16; V. 1 + 3; in the 3 specimens from the Germania- 

 expedition: D.^ 7—8; D.2 13—14; A. 13—15. I do not think 

 either that the front between the eyes is more concave than in 

 the East-Greenland form ; the difference is at any rate slight 

 and by no means invariable. 



According to my opinion we are not justified in regarding 

 the Fourhorned Bullhead from East-Greenland and the Baltic one 

 as two different species. I do not wish at present to answer the 

 question if we should regard them as special varieties on account 

 of the above named dissimilarities. For in order to decide the 

 question of formation of race , within the present species, it 

 would be necessary to have for comparison specimens from 

 the other places of the habitat of the species, namely from the 

 White-Sea, the ley Sea of Siberia, and Arctic America, but 

 from these seas 1 have no material. 



1 must here however mention that Jordan and Evermann 

 still maintain the species Coitus (Oncocottus) hexacornis Ri- 

 chardson, with a western (American-West-Greenland) distribution 

 against С (0.) quadricornis L., with an eastern (European-East- 

 Greenland) distribution, yet remarking that the distinguishing 

 characters between them are of doubtful value, and that they 

 must probably be reduced to one species^), in their analytical 

 table the two species are distinguished in the following way: 

 a. Atlantic species; maxillary short; pectoral moderate ; caudal 



rounded Quadricornis 



aa. Arctic American species; maxillary longer; pectoral longer; 



caudal truncate Hexacornis 



') Sveriges och Norges Fiskar, I, 1891, p. 144. 



2) Fishes of North and Middle America, Part II, 1898, p. 2001—2004. 



