GEN. LETJCISCUS. THE GRAINING. 75 



flesh, though preferred to that of Roach, is still not 

 much esteemed. In some parts of England it is 

 known under the names of Dart and Dare. 



(Sp. 109.) L. Lancastriensis. The Graining. 

 Mr. Pennant, we believe, was the first to direct 

 attention to this fish, which he found in the Mersey, 

 and remarked that it resembled the Dace, but was 

 more slender, and with a straighter back : its usual 

 length he found about seven inches and a half; its 

 colour on the back silvery, with a bluish cast ; the 

 iris red ; also the ventral and anal fins, but paler 

 than those of the Dace ; the pectoral redder. The 

 Earl of Derby, President of the Zoological Society, 

 having presented some specimens of this fish to 

 Mr. Yarrell, from the streams in Knowsley Park, 

 we are supplied with some additional information 

 by our eminent Ichthyologist. Several of the tribu- 

 taries of the Mersey supply considerable numbers, 

 and he regards it as a distinct species. In its habits 

 and food it resembles the Trout, frequenting both 

 the rapid and the still parts of the stream ; but it is 

 not known to exist in ponds. Like Dace and Trout, 

 it is fished with artificial flies, which it often takes 

 with sufficient avidity. They sometimes, but not 

 commonly, exceed half a pound in weight, and are 

 much better eating than the Dace. Mr. Thompson 

 of Belfast mentions that he saw several small speci- 

 mens of this fish in the Learn, near Leamington; 

 which M. Agassiz immediately recognized as identi- 

 cal with a species inhabiting some of the lakes ia 



