Clafs IV. Me Dd OME 299 
The Zwazte, on the contrary, weighs from half a 
pound to two pounds, which it never exceeds. 
The twaite differs from a {mall fhad only in hay- 
ing one or more round black {pots on the fides ; if 
only one, it is always near the gill, but commonly 
there are three or four, placed one under the other*. 
The other particulars agree in each fo exactly, that 
the fame defcription will ferve for both. 
The head flopes down confiderably from the 
back, which at the beginning is very convex, and 
rather fharp: the body from thence grows gradu- 
ally lefs to the tail. 
The under jaw is rather longer than the upper: 
the teeth very minute. 
The dorfal fin is placed very near the centre, is 
_ {mall, and the middle rays are the longeft: the pec- 
toral and ventral fins are fmall: the tail vaftly fork- 
ed: the belly extremely fharp, and moft ftrongly 
ferrated. 
The back is of a dufky blue: above the gills 
begins a line of dark fpots, which mark the upper 
part of the back on each fide; the number of thefe 
{pots is uncertain in different fith, from four to ten. 
The fides_and belly are filvery. 
* IT muft here acknowlege my obligations to Doctor Ly/ons, 
of Gloucefter, for his communications relating to this fifh, as well 
‘as to feveral other articles relating to thofe of the Severn. 
Defer, 
Color, 
oR bash Genus 
