Subopercle and postclavicle thick, smooth, dense, like ivory. 
Vertebrae 52, of which 33 caudal. 
Closely related to Pollachius, differing chiefly in ivory like 
structure of the subopercle and postclavicle bones. Two species in the 
North Pacific. 
* 
Theragra'chalcogramma (Pallas) 
Gadus chalcogrammus PALLAS, -Zoogr. Ross. Asiat., vol. 5, p. 
198, 1811 (type locality: Ochotsk Sea; Kamchatka). 
Theragra chalc ogramma EVERMANN and GOLDSBOROUGH, Bull. Bur. 
♦ 
Fisher., vol. 26, p. 346, fig. 127, 1906 (1907) (Cleveland 
Passage, Skagway, Karluk, Shakan, Sand Point, Fox Harbor, 
Dundas Bay, Pavlof Harbor, Unalaska; Chignik Bay; Sitkoh Bay; 
Loring; Link Bay; Kamchatka; St. Paul Island). ——FRANZ, Aohandl. 
Kon. Bayer. Akad. Wiss., vol. 4, Suppl. band 1, p. 30, 1910 
(Yokohama). —JORDAN, TANAKA, SNYDER, Journ. College Sci. 
Tokyo, vol\ 33, art. 1, p. 406, 1913 (Bering Sea; Sitka; Kuriles; 
Robben'; Hokkaido; Toyama Bay). —JORDAN and HUBBS, Mem. Carnegie 
Mus., vol. 10, no. 2, p. 326, June 27, 1925 (Hoo). 
