. PLATfc 1 1 9 
PLATE LIV. 
PETROMYZON FLUVIATILIS. 
LAMPERN, or LESSER LAMPREY. 
****** pjsCES CHONDROPTERYGII. 
GENERIC CHARACTER. 
Head more slender than the body. Mouth longer above than be- 
neath : teeth orange, hollow within, and surrounded by a fleshy 
margin. Spiracles feven on each side the neck. A fistulous aperture 
on the nape. Without pectoral, and ventral fins. 
SPECIFIC CHARACTER 
AND 
.. SYNONYMS. 
Second dorsal fin angulated. 
Petromyzon FLUviATtLis, pinna dorsali posteriore angulata. 
Linn. Fn. Suec. 290.— Gmel. Syst. Nat. I. 
p. 3. 1514. sp. 2. 
Petromyzon unico ordine denticulorum minimorum in limbo oris 
praeter inferiores majores. Arted. gen. 64. 
syn. 89. sp. 99. 
