ART. 13 



REVISION OF THE COTTOID FISHES SCHMIDT 



ARTEDIELLUS UNCINATUS Reinhardt (1837) 



Cottus undnatus Reinhakdt, Dansk. Vid. Selsk., Nat. Math. Afh. 1837, 



p. liv; 1838, pp. 117, 118. 

 Centridermichthys uncinatus Smitt, Scand. Fishes, pt. 1, 1892, p. 163. 

 Artediellus atlanticus Jordan and Evermann, Bull. U. S. Nat. Mus. No. 47, 



Fish. North and Middle Amer., pt. 2, 1898, p. 1906. 

 Artediellus uncinatus Knipovitsch, Mem. Acad. Imp. Sci. St. Petersbourg, 



p. liv ; 1838, pp. 117, 118. 



This species described first by Eeinhardt from Greenland, differs, 

 as shown by Knipovitsch, from the European form. Having com- 

 pared now some of our specimens from the Davis Strait (from the 

 collections of United States National Museum in Washington) with 

 other specimens of our Leningrad collections from Spitsbergen and 

 Barents Sea I agree completely with this opinion. The incorrect 

 drawing of Collett ^ with bony protuberances provided with radiat- 

 ing ridges, has led Jordan and Evermann to describe a new species 

 Artediellus atlmiticus, differing chiefly in having " blunt protuber- 

 ances on the occiput." But the bony tubercles are completely alike 

 in both forms, American and European. They are blunt, triangular 

 in shape from the side, directed backward and developed in different 

 degree. 



This species differs frr.m Artediellus europaeus Knipovitsch, in 

 having 27-30 pores in the lateral line instead of 20-23 pores, and 

 curiously enough it is the same difference that we find between the 

 eastern and western species in the Pacific Ocean, namely, between 

 Artediellus paciflcu^ and A. ochotensis, as shown in the following 

 table : 



The coloration of the American species seems also to be very 

 peculiar, as on the dorsal and on the pectoral fins we find rows of 

 round white spots, not connected to continuous crossbands, as in 

 the European form. 



Our material is not large enough for establishing these two species 

 with full certainty, but as we have no forms with intermediate num- 



^ Norske Nordhavs Exped., vol. 3, 1880, Fishes, pi. 1, Qg. 7. 



