436 THE FUR SEALS OF THE PRIBILOF ISLANDS. 



16 Coregonus quadrilateralis RicUardson. 

 Eecorded by Dr. Beau from Nulato. 



17. Coregonus clupeiformis (Mitchill). 



Recorded from St. Michaels aud Nulato by Dr. Bean. 



18. Coregonus nelsoni Bean. 



Described from Nulato; also recorded from Bristol Bay. 



19. Argyrosomus pusillus Beau. 



Recorded from St. Michaels and other localities in northern Alaska. 



20. Argyrosomus laurettse Bean. 



The original types from Port Clarence and Point Barrow ; also recorded from 

 Nulato, Yukon Elver, and by Dr. Gilbert from Nushagak and Naknek rivers, Bristol 

 Bay. 



21. Argyrosomus alascauus Soofield. (Plate XLII.) 



Described from Point Hope and Grantly Harbor. 



22. Oncorhynchus nerka (Walbaum). Eedfish; Krasiiaja Byba. Blue-back. 



Recorded from many localities iu southern and western Alaska and from Kam- 

 chatka; the common salmon of the cauners iu Alaska. Obtained by us in Captains 

 Harbor, Unalaska, at Karluk, and Beriug Island. 



23. Oncorhynchus kisutch (Walbaum). Silver salmon. Kisutch. 



Summer Bay, Unalaska (fresh- water lake), July 3, 1896; Mkolski, Beriug Island, 

 July 31, 1896; Karluk, 1897. 



From the lake near Summer Bay we have three sizes, probably representing as 

 many years' growth. The smallest are 30 to 60 mm., the second size 110 to 135 mm., 

 the third 200 to 215 mm. Intermediate sizes are of course likely to occur, but the 

 majority of specimens seem to range themselves in these groups. The larger size 

 show the parr marks faintly and much more silvery thau the smaller specimens, 

 appearing as though they were recently in from the sea. The black blotch on dorsal 

 followed by the sharply contrasting white posterior rays fofms a very conspicuous 

 mark in advanced stages. The adipose flu is black margined. Coarse black spots or 

 blotches are present along the back in the very young, iu addition to the parr marks. 

 They are soon replaced by the finer spots of the adult. Very young specimens have 

 a whitish anterior margin to dorsal and anal fins, followed by a blackish intramarginal 

 band, and the anterior rays may be produced. Common at Unalaska, the young 

 abounding in the sea and lakes. The dorsal fin largely black in life. The species is 

 recorded by Dr. Bean from various stations in Alaska. 



24. Oncorhynchus keta (Walbaum). Dog salmon; Hayko; Calico salmon; Chum salmon. 



Seen by us only at Karluk. Found in Bering Sea, but the localities uncertain. 

 It is probably, like the two preceding species, universally diffused, but it is less 

 abundant than either of these. It is not used by the canners, as it is said to " taste 

 like mush " when boiled. It is said to be of fair quality when fresh. It was not taken 

 by Stejneger on Bering Island. 



25. Oncorhynchus tachawytscha (Walbaum). King salmon; Tachawytscha; Taavicha. 



Recorded by Dr. Bean from Yukon River, and by Dr. Gilbert from Unalaska and 

 from the Nushagak River, Bristol Bay; not seen in the summer of 1896, except at 



