436 THE FUK SEALS OF THE PRIBILOF ISLANDS. 



16 Coregonus quadrilateralis Ixiclianlsoii. 

 Kecurded by Dr. Bean from 2siilato. 



17. Coregonus clupeiformis (Mitchill). 



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



18. Coregonus nelsoni IJeau. 



Described from Nulato; also recordetl from Bristol Bay. 



19. Argyrosomus pusillus Bean. 



Kecorded from St. Michaels aud other localities iu uortheru Alaska. 



20. Argyrosomus laurettae Heau. 



The orififitial tyi»es from Port Clarence and Point Barrow; also recorded from 

 Nnlato, Ynkon Biver, and by Dr. Gilbert from Nushagak and Naknek rivers, Bristol 

 Bay. 



21. Argyrosomus alascanus Scolield. (Plate XLIL) 



Described from Point Hope aud Grautly Harbor. 



22. Oncorhynchus nerka ( Walbauin). Kedli.sli; Jirdnniiia lij/ba. Bhie-back. 



Kecorded from many localities in southern and western Alaska aud from Kam- 

 chatka; the common salmon of the canners in Alaska. Obtained by us in Captaius 

 Harbor, Unalaska, at Karluk, and Bering Island. 



23. Oncorhynchus kisutch (Walbamii). Silver salmon. Kisntch. 



Summer Bay, Unalaska (freshwater lake), July 3, 1806; Nikolski. Bering Island, 

 July M, 18%; Karluk, 1897. 



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

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

 the third 200 to l.'15 mm. Intermediate sizes are of course likely to occur, but the 

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

 show the parr marks laintly aiul much more silvery than 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 forms a very conspicuous 

 mark iu advanced stages. The adipose Hn is black margined. Coarse black spots or 

 blotcdies are present along the back in the very young, in 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 tins, followed by a blackish intramarginal 

 baud, 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 (Walbaiiin). Dogsalmou; Hayko; Calico .salmon; C'bum 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 u.sed by the canuers, 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 tschawytscha (Walhuum). Kiu^l; salmon ; TschawtjlKrha: Tsaiicha. 



Itecorded by Dr. Bean from Yukon liiver, and by Dr. Gilbert from Unalaska and 

 from the Nushagak River, Bristol Bay; not seen in the summer of 1800, except at 



