. The fishes of North and Middle America [microform] : a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Fishes; Fishes; Poissons; Poissons. Jordan and Evcrmann.âFishes of North Amenca. 2535 OaduB colinus, LAc£i>i>,DB, Ilist. Nat. Pcriss., ii, 416,1800, England, etc.; after le Colin of Danberton. Oadua virenn, LACEPfeDE, Ilist. Nat. Poiss., ii, 417,1800. Merlangrupurpureus, , Trans. Lit. and IMiil Soc, 1,1816, 370, New York. Merlangus leptoeephalus, De Kay, New York Fauna: Fishes, 288, pi. 45, f
. The fishes of North and Middle America [microform] : a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Fishes; Fishes; Poissons; Poissons. Jordan and Evcrmann.âFishes of North Amenca. 2535 OaduB colinus, LAc£i>i>,DB, Ilist. Nat. Pcriss., ii, 416,1800, England, etc.; after le Colin of Danberton. Oadua virenn, LACEPfeDE, Ilist. Nat. Poiss., ii, 417,1800. Merlangrupurpureus, , Trans. Lit. and IMiil Soc, 1,1816, 370, New York. Merlangus leptoeephalus, De Kay, New York Fauna: Fishes, 288, pi. 45, flg. 146,1842, Long Island. Merlanguspurpureus, Storer, Kept. Fish. Mass., 130,1830. Pollachitis carhonarlui. Gill, Proc. Ac. Nat. Sci. Phila. 1863, 978, THERAGRA, Lucas, a new genus. (Alaskan Pollacks.) Theragra, LucAS, in Jordan &. (Jilbevt, Uept. Fur Seal Invest. 1896 (1898) (chalcogrammus). This genus is closely allied to PoUachius, differing in the following respects: Suboperculum thick, smooth and deuse instead of being thin and squamous as in I'oUaehius; the postclaviohi is also similar in struc- ture while its proximal portion is subcircular in Theragra and rhomboidal in Pollachiua; this ivory-like ('haracter of the Huboporculum and post- clavicle is so marked that it serves to distinguish tlu'se bones at a glance, being entirely different from what is found in the corresponding bones of other gadoids. The Alaskan Pollack farther differs from the Atlantic Pol- lack in having 19 precaudal vertebrto and 33 caudal, instead of 23 precau- (ials and 32 caudals; the bodies of the vertebrae are also slightly longer and more deeply sculptured in the Alaskan fish and the spinous process of the anterior dorsals less elevated. The vertebral* differences between the 2 genera are nu'rely differences of degree and of specific value only, but the differences between the subopercula and postclavicula are different in kind, distinguishing the Alaskan Pollack not only from the
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