Jordan and Ercrtnann. Fishes of North America. 13 



/). Infrai>ral lamina with 7 cusps ; dorsals wholly separate. AUREA, 12. 



II. Infraoral lamina with S or 9 cusps. 



c. Lateral teeth usually 4 on each side, nil bicuspid ; dorsals separate. 



SPAIMCEA, 13. 



ir. Lateral teeth usually 3 on each side of disk, the middle one tricuspid, the others 

 bicuspid ; dorsals slightly connected. CIBARIA, 14. 



<r. Dorsal fins distinctly united, with a sharp notch ; lateral teeth usually 3, bicuspid. 



WILUERI, 15. 

 12. LAMPETRA AUREA, (Bean). 



Dorsal fins separate, the first | the height of the second, the inter- 

 space ;i the length of the first; infraoral lamina with 7 cusps, the outer 

 largest; head shorter than thorax, 10| in length. Plumbeous, golden 

 below. (Bean.) Yukon River and streams of Alaska and Kamchatka. L. 

 about a foot. Very close to the European L. fluviatilis. (aureus, golden.) 



Annn,;i(,'x mtreux, BEAN, Proc. U. S. Nat. Mus., 1881, 159, Yukon River; (Type, No. 21524); 



JORDAN & GILBERT, Synopsis, 808, 1883. 

 l.(i)iq>rtni ruiiifsrhttltca, PALLAS, Zoogr. Rosso-Asiat., in, G7, 1811, Kamchatka. This was 



apparently not intended as a binomial name. 

 ? I'et>-(K>/::<nt l>n,-i'<ili* t GIRARD, Pac. R. R. Surv., 377, 1858, after P. fluvialis, Richardson, mentioned 



only as a small lamprey attached to an Inconmi in Great Slave Lake, "very like Bloch's 



figure" of L.flin-infiUx. 



13. LAMPETRA SPADICEA, Bean. 



Dorsals separated, the interspace i the snout, insertion of first at 

 middle of body ; second dorsal little higher than first; infraoral lamina 

 with 9 cusps, the outer largest; lingual teeth with about 20pectinse; 4 

 bicuspid teeth on each side of disk. Guanajuato, Mexico. (Bean.) (spa- 

 , nut-brown.) 



ra .ymUcea, BEAN, Proc. U. S. Nat. Mus., 1887, 374, Guanajuato, Mexico. (Type, No. 

 38005.) 



14. LAMPETRA CIBARIA, (Girard). 



Lips fringed; infraoral lamina with 8 or 9 subequal cusps; about three 

 teeth on each side of buccal disk, the middle one usually tricuspid, the 

 others bicuspid; teeth on upper part of disk simple; dorsal fins slightly 

 connected at base; second dorsal not much higher than first, much lower 

 than in L. wilderi; insertion of dorsal a little behind middle of body; 

 63 muscular depressions between last gill opening and vent; head 10 in 

 length. Color plumbeous, sides silvery. L. 8 inches. Pacific slope, from 

 Fraser River to the Sacramento, Rather common in the rivers and brooks 

 northward, (cibarius, pertaining to food.) 



Petromyzon plinitlrut, AYKES, Proc. Cal. Ac. Sci., 1854, 28, (name preoccupied), San Francisco. 

 es cibarius, GIRARD, Pac. R. R. Surv., 383, 1858, larva, Puget Sound; JORDAN & FORDICE, 

 l.<:, 292, 188G. (Type, No. 6176.) - 



ayresi, GUNTIIER, Cat., vm, 505, 1870, British Columbia. 

 plumlea, JORDAN <fe GILBERT, Synopsis, 8, 1883. 



16. LAMPETRA WILDERI, Gage, new species. 



(SMALL BLACK LAMPREY.) 



Head moderate, about as long as the thorax ; mouth small ; snout shorter 

 and lips, less fringed than in L. planeri; dorsal fins connected only in 

 breeding season, inserted behind middle of body, considerably depressed 

 in front of the vent, but not divided into 2 fins; posterior lobe highest ; 



