238 
nov. Mus. i. 64. n. 114; Zooph. 38.—Mustela, Pliny, liv. 9. c. 17. 
—Mustela fluviatilis, Belon, Aquat. 75.—Lampetra subcinerea, ma- 
culis carens, Salv. Aquat. 62.—Lampetra, alterum genus, Gesn. 
Aquat. 597.—Lampreda, Icon. Anim. 326.—Lampetra, medium ge- 
nus, Will. Ichth. 106. tab. g. 2, 3. f.1,2; Ray, Syn. Pisc. 25. n. 1. 
—Lampetra fluviatilis, Aldroy. 587; Jonston, 104. pl. 28. f. 11; 
Schone, 41 ; Charlet, 159. n.7; Marseli, Dan. Pann. iv. 2. t. 1, 1726. 
—Lampetra fluviatilis, media, Schwenck. Theriotr. Siles. 532.— 
Jaatz me unagi, Kempfer, Voy. dans le Japan, i. 156. pl. 12. f. 2.— 
Minog, Rzezynski,.134.—Lamproie, Fermin, Hist. Nat. de Surinam, 
85.—Petromyzon, Kramer, Elenchus, 38. n. 1; Klein, Mise. Pise. 
iii. 29.n.1.t.1.f. 3.—Le Petromyzon pricka, Lacépéde, Hist. Nat. 
des Poiss. i. 18, 1798. 
Hab. Europe. 
2. LAMPETRA PLANERI. FRINGED-LIPPED LAMPERN. 
Petromyzon planeri, Linn. Bloch, vii. pl. 78. f. 3; Linn. (édit. de 
Gmelin) ; Schneid. Bloch, 531, 532, 4, 1801; Shaw, Gen. Zool. v. 
pt. 2. p. 259, 1804; Jen. Man. Brit. Vert. 522. sp. 211, 1835; Mill. 
Mém. de I’Acad. Berlin, 78, 1834; Cuv. Rég. An. ii. 404, 1829; 
Yarr. Brit. Fish. 2 ed. ii. 607, 1841.—Lamproiea planer, Bonn. 
Planches de l’Encycl. Méth.—Le Pétromyzon planer, Lacépéde, 
Hist. Nat. des Poiss. i. 30. pl. 3, 1798. 
Hab. Europe. 
** Dorsal fin in contact with the second. 
3. LAMPETRA SANGUISUGA. LErErcH LAMPERN. 
Petromyzon Sanguisuga, Lacépéde, Hist. Nat. des Poiss. ii. 99. 
pl. 1; Supp. to Petromyzon; Shaw, Gen. Zool. v. pt. 2. p. 261, 1804. 
—Petromyzon planeri, var., Cuv. Rég. An. ii. 118. 
Hab. Europe, Seine. 
A very doubtful species ; Cuvier says it is the same as the former. 
4, Lampetra LAMoTTENTI. AMERICAN LAMPERN. 
Petromyzon Lamottenii, Lesueur, Hist. N. A.; De Kay, Nat. Hist. 
of New York, 382. pl. 79. f. 249 (mouth), pt.1; Zool. 1842. 
Hab. N. America, New York. 
3. GEOTRIA, n.g. (Pisces, Pl. IV. fig. 3.) 
Upper internal tooth large, transverse, crescent-like, divided into 
four lobes ; the two inner lobes small, acute; outer truncated. The 
lower internal tooth transverse, narrow, slightly simuous. The labial 
teeth numerous, far apart, conical, acute, in arched series, diverging 
from the throat; the innermost one larger, rest small; the inner- 
most one of the lower part on each side small, elongate, transverse, 
with two small, rudimentary tubercles. ‘Tongue with two elongate, 
conical, arched teeth, with a triangular plate on the lower side of the 
base. Throat with a very large dilatable pouch. Dorsal. fins two, 
