237 
3. ?PETROMYZON AMERICANUS. AMERICAN Sea Lamprey. 
Petromyzon marinus, Schepf. Beobachtungen, &c. viii. 184; 
Mitch. Trans. Lit. & Phil. Soc. i. 461 .—Petromyzon americanus, Le- 
sueur, Amer. Phil. Soc. (N. 8.) i. 382; Hist. N. A. Fish. ined. plate ; 
Storer, Rep. on the Fishes of Massachusetts ; De Kay, Nat. Hist. of 
New York, 379. pl. 66. f. 216. pt.1; Zool. 1842. 
Hab. N. America. 
4. PeTROMYZON NIGRICANS. Buuisn Sea Lamprey. 
Petromyzon nigricans, Lesueur, Amer. Phil. Soc. (N. S.) i. 385; 
Storer, Rep. on the Fishes of Massachusetts ; De Kay, Nat. Hist. of 
New York, 381. pl. 79. f. 247 (teeth indistinct), pt. 1; Zool. 1842. 
Hab. N. America. 
5. PETROMYZON ARGENTEUS. SILVERY LAMPREY. 
Petromyzon argenteus, Kirtland, Boston Journ. iii. 342. pl. 4. f. 3; 
De Kay, Nat. Hist. of New York, 382. pt. 1; Zool. 1842. 
Hab. N. America, river Ohio. 
2. LAMPETRA. (Pisces, Pl. IV. fig. 2.) 
Upper inner tooth single, transverse, lunate, entire, with a conical 
prominence at each end. Lower inner tooth single, transverse, lu- 
nate, many-toothed, outer lobe largest. Labial teeth unequal, the 
outer numerous, small, subequal, conical, in a single, submarginal 
series, the inner larger, unequal ; of the upper part small, in series ; 
of the sides in a single series, larger, with two or three conical tu- 
bercles. Tongue with two compressed, pectinated teeth above, and 
a large, crescent-shaped, transverse tooth below, crenated on the edge, 
and with a larger, conical projection in the centre. 
Yarr. Brit. Fish. fig. p. 604; De Kay, Nat. Hist. of New York, 
t. 79, 249 (bad).—Petromyzon, sp., Linn., Cuv., Miull.—Lampetra, 
sp., Ray.—Lampetra, Gray, Proc. Zool. Soc. 1851. 
* Dorsal fins separate. 
1. LaMPetTRA FLUVIATILIS. LAMPERN or River Lamprey. 
Petromyzon fluviatilis, Linn. Bloch, pt. 3. pl. 78. f.1; Linn. (edit. 
de Gmel.); Mull. Prod. 37. n. 307 ; Aldroy. 587; Penn. Brit. Zool. 
v. pt. 106. pl. 10, 1776-78; Schneid. Bloch, 530, 2, 1801; Shaw, 
Gen. Zool. 257. pt. 2, 1804; Don. Brit. Fish. pl. 80, 1820-28 ; Flem. 
Brit. An. 404, 1827; Cuv. Rég. An. ii. 404, 1829; Mém. de P Acad. 
Berlin, 78, 1834; Jen. Man. Brit. Vert. 521. sp. 210, 1835; Yarr. 
Brit. Fish. 2 ed. ii. 598, 1841 ; Parnell; Rich. Faun. Bor. 294, 1836. 
—Petromyzon fluviatilis, Cuv. Rég. An. ii. 118, 1817.—Lamproie 
prycka, Daub. Eneycl. Méth.—Nein-oga natting, Faun. Suec. 106. 
—Petromyzon, §c., Artedi, gen. 64. syn. 89. sp. 99.— La petite Lam- 
proie, Bloch, 34. pt. 3. pl. 78. f. 1.—La Lamproie branchiale, Bonn. 
Planches de l’Encyel. Méth.—Petromyzon, Prick (negen-oog), Gro- 
