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THE SHAI 5 . '• 
the Severn there is a variety caught near Glocejler, called 
the twaite, which is equally difcfteemed with the Thames 
fhad. Thefe varieties are diftinguilhed by their iize, the 
twaite being nearly one half fmaller than the true Iliad j 
and has always few'er black fpots behind the gills *. 
* Britifli Zoology, Gen. 39. 
