26l 



RED LAMPREY. 



Petromyzon Ruber. P. ruber ^ dorso subfusco. 

 Red Lamprey^ with brownish back. 

 ' Petromyzon ruber. Cepede, 



General appearance that of the minute lamprey : 

 colour red, deepest about the gills or respiratory 

 foramina : upper parts tinged with a dusky hue ; 

 found in some parts of the Seine, where it was ob- 

 served by Mons''. Noel, who communicated it to 

 the Count de Cepede. 



LEECH LAMPREY. 



Petromyzon Sangulsuga. P. ore amplo, dentibus minimis 



aurantiis, pinnis angustis. 

 Lamprey with large mouth, very small orange-coloured teeth, 



and shallow fins. 

 Petromyzon Sanguisuga. Cepede, 



General length about seven inches : habit that 

 of the minute and red lampries : body cylindric : 

 mouth very wide : teeth very numerous, orange- 

 coloured, and a semicircular range of nine double 

 teeth near the throat : both the dorsal fins shallow, 

 the second extending nearly to the tail : eyes larger 

 than in the minute lamprey : observed in the river 

 Seine by Mons^ Noel. It seems in many points 

 so nearly to resemble the common Lamprey as to 

 leave some suspicion of its being the young of that 

 species: yet Mons^ Noel seems convinced of its 



