(^) 



Fig. 19.— Dia<jiam tontra.sliny outlines of tail of a Tweed " Uiili 'iroiii " and 



of a Loch Lomond Sea-trout, 

 (i) Tail of Tweed "bull trout" (7] lb.). 

 (2) Tail of Loch Lomond sea-trout (.1^ lb.). 



See page 63. 



