263 



LEAD-COLOURED LAMPREY. 



Petromyzon Plumbeus. P. plumbeus, suhtus albo-flavescens, 



Cauda spatidiformi. 

 Lead-coloured Lamprey, yellowish- white beneath, with spatule- 



shaped tail. 

 Petromyzon Septoeil. Cepede. 4. p. 6Q7. 



Body decreasing from head to tail in a conical 

 manner : mouth large : dorsal fins rounded : tail 

 spatule-shaped : colour of the upper part of the 

 animal leaden-grey ; of the under yellowish white : 

 size not mentioned : observed by Mons"^. Noel in 

 the Seine, where it is very plentiful. 



BRILLIANT LAMPREY. 



petromyzon Bicolor. P. supra niger, suhtus argenteus. 

 Lamprey with black back, and silvery abdomen. 

 Petromyzon niger. Cepede. 4. p. 66/. 



This species is easily distinguished by its colours, 

 the upper part being of a fine black, and the under 

 of a brilliant silver-colour: the mouth is very small: 

 both the dorsal fins rounded, and each nearly as 

 short as the caudal, which is spatule-shaped : first 

 described by Mons*". Noel, by whom it was com- 

 municated to the Count de Cepede : found in the 

 Seine, and said to be sometimes taken in great 

 plenty: size not mentioned. 



