CLASS PISCES. 623 



sinuous fold. They remain in the mud of streams, 

 and have a great deal of the habits of the worms, 

 which they resemble so much. 



We have one named 



Petrom. bra?ichialis, L. {Lamprillon, Lamproyon, 

 &c.) Six or eight inches long, about as thick as a 

 stout quill, which is accused of sucking the gills of 

 fishes, perhaps because it is confounded with the 

 Petrom. planeri. It is employed as bait in hook- 

 fishing. 



1 See Omalius de Hallois, Journ. de Phys. Mai, 1808. N.B. The 

 Petrom. rouge, Lac. II. i. 2. is of this genus ; perhaps it does not 

 differ essentially from the common Lamprillon. 



