10 Bulletin 4j, United States National Museum. 



lingual tooth with a median depression ; buccal disk large, with nnmerous 

 teeth arranged in concentric scries ; dorsal fins separate, the second joined 

 to the caudal. 



North Atlantic, ascending rivers; one species known, the largest of the 

 lampreys. (Trtrpa, stone; ;ui;s'w, to suck.) 



8. PETROMYZOJf MAKINUS, Linnaeus. 

 (Great Sea Lamprev ; Lamprey Eel.) 



Head large, longer than the branchial area ; buccal disk large, with 

 numerous conical teeth, arranged in obliquely transverse series, 4 to 7 in 

 each row ; lateral teeth on each side of mouth bicuspid, the other teeth 

 simple; dorsals low, well separated; the second dorsal with a depression 

 on the tail; lips moderately fringed; males and often females, in spring, 

 with an elevated lleshy ridge on back before dorsal fin ; 64 muscular im- 

 pressions between gill openings and vent. Color bluish brown, mottled 

 with Idackish confluent patches, rarely nearly plain ; whitish below. 

 Length 24 to 36 inches. Atlantic coasts of Europe and North America, 

 southward to Chesapeake Bay, abundant northward, ascending streams 

 in the spring to deposit its spawn. (Eu.) 



Petromyzoa marinm, LiNv.^i'S, Syst. Nat., Ed. x, 1758, 230, European Seas; (after Artpdi); 

 Gf'NTiiER, Cat., VIII, r)01 ; Jordan & Gilbert, Synopsis, 11, 1S83 ; Jordan & Fordice, Ann. 

 Ac. Sci. N. Y., 18SG, 2S:i. 



Petrovu/zou aiticricamis, Le Sueur, Trans. Am. Phil. Soc. Phila., i, 383, 1818, Coast of Massachu- 

 setts; Storer, Fish. Mass., 251, pi. 38, fig. 4,1807. 



Petromijzon nigricans, Le Sueur, I. c, 385, 1818, Massachusetts. 



Ammoaetes hicolor, Le Sueur, I. c, 386, 1818,(larva), Northampton, Massachusetts. 



Pelromijzon appemlir, De Kay, N. Y. Fauna: Fishes, 381,1842, (yoiing). Providence; Hudson 

 River. 



f Pelromijzon himnlleni, Le Sueur, in Pe Kay, L c, 382, 1842, no locality. 



Represented in fresh waters by 



Sa. PETKOMTZOV MARINUS FXICOLOR, (Do Kay). 



A dwarfish form similar to the common lamprey ; darker and more uni- 

 form in color, tlie dorsal ridge larger, the fins closer together; found land- 

 locked in the lakes of northern and central New York ; abundant in 

 Cayuga Lake. 



Ammocn-leii vtiicohr, De Kay, N. Y. F.auna: Fislies, 383, 1R42, (l.arva). Lake Champlain. 

 Pelromir-nn murimiis (Inrsaliif, Wilder MS., Jordan & (Jilbert, Synopsis, 8(i!», 1883, Cayuga Lake. 



(Type, No. 313(18) ; Gaoe, Wilder Quarter Century Book, 1893, 420. 

 Pctromi/zon ninrinns unicolor, Meek, Ann. Ac. Sei. N. Y., 1886, 284. 



7. ICHTHYOMYZON, Girard. 

 (River Lampheys.) 



Ichlhynmiiznn, Girard, Pac. R. K. Siir., x, 381,1858, {argentem). 

 ScolecnuotiKi, (Jiraiid, J. c, 385, 18."i8, {cnnmlor, Inrra). 



Allied to Pciromyzon, but with the anterior lingual tooth divided by a 

 median groove. Dorsal fin continuous, with a broad notch. Small 

 lampreys; confined to fresh waters in eastern United States. {Ix-^hq, 

 fish; //iCw, to suck.) 



