NATURAL SCIENCES OP PHILADELPHIA. 251 



reviewer, restricted the name Gadas to the genus named Melanogrammus 

 and retained Cuvier's Morrhua for the present genus. 



The genus Gadus as here denned does not embrace a number of species re- 

 ferred to it by previous authors, for from it, by the terms of the description, 

 are excluded the Gadus aegliftnus of Linnaeus, or the common baddock, which 

 now is the type of the genus Melanogrammus ; the Gadus minutus and G. 

 luscus of Linnaeus belonging to Brackygadus. 



The species, or at least the nominal specie3, of authors which appear to be 

 really congeneric and members of the same genus Gadus are the follow- 

 ing. Those whose claims to specific rank are most doubtful and require to 

 be confirmed, are indicated by an asterisk placed after their respective names. 



1. 



Anus under the anterior portion of the second dorsal fin. 



Gadus morrhua Linn. 

 Northern European and Polar Seas. 



Gadus arenosus Mitchill.* 

 Coast of Middle and Eastern United States northwards to Hudson's Bay. 



Gadus ojac Richardson.* 

 Greenland. 



Gadus navaga Koelrenter. 

 Coasts of Northern Russia. 



Gadus gracilis Tilesius. (*) 

 Kamtschatka. 



Gadus macrocephalus Tilesius. 

 Kamtschatka. * 



11. 

 Anus under the hinder portion of first dorsal. 



Gadus tojicodus Walbaum. 

 Middle and Eastern States northwards to Newfoundland. 



Gadus proximus Girard. 



California and Oregon. 



It is very doubtful, from the slight description, whether the Gadus pyg- 

 mozus of Pallas belongs to this genus : it is said to have five (?) branchi- 

 ostegal rays, the lateral line obsolescent behind, and the following number of 

 fin rays: D. 16 | 16 | 19. A. 18 | 15. C. 28, very much crowded. P. 17. 

 V. 6. The specimen described, about seven inches long, was obtained by 

 Dr. Merk at Cape Elias in Russian America. It is asked by Pallas whether 

 it may not be the Gadus minutus of Linnaeus ? Such cannot be the case. 



Gadus gracilis Tilesius. 



Synonymy. 

 Gadus wachna Pallas, Zoographia Rosso-Asiatica, vol. iii. p. 182, 1831. 

 Gadus gracilis Tilesius, in Zoographia Rosso-Asiatica, vol. iii. p. 182, 1831. 

 " " " Memoires de l'Academie Imperiale des Sciences de St, 



Petersbourg, tome ii. p. 354, tab. 18. (1808) 1810. 

 Tilesia gracilis Swainson, Natural History of Fishes, Amphibians and Reptiles, 

 vol. ii. p. 300, 1839. 

 Hab. Kamtschatka and Kurile Islands (and Oregon ?) 



(*) The position of the anus in this species is doubtful, but it probably belongs to this section. 



1863.] 



