. British and Irish Salmonidæ. e, 14-C in. long, 2;; male, Howietoun, 14-G in., 2-i ; female, Loch Leven, 14-4 in., 2i;; Ard, 113 in., 2J ; female, Eiver , 10-4 in. long, 2J; male, 10-2 in. long, Gloucestershire,2S; female, 10-1 in. long, 2i ; male, 72 in. long, Stirlingshire, 2J ; and male, 6-5 in. long,Gloucestershire, 2! in the total length. FRESH-WATER TROUT—FINS, SCALES, AND CiECA OF. 199 this fin is most developed in tliose taken from running waters.* Ventrals insertedIbeneatli tlie middle or last third of the base of the dorsal fin. Caudal forked inthe very young, ema
. British and Irish Salmonidæ. e, 14-C in. long, 2;; male, Howietoun, 14-G in., 2-i ; female, Loch Leven, 14-4 in., 2i;; Ard, 113 in., 2J ; female, Eiver , 10-4 in. long, 2J; male, 10-2 in. long, Gloucestershire,2S; female, 10-1 in. long, 2i ; male, 72 in. long, Stirlingshire, 2J ; and male, 6-5 in. long,Gloucestershire, 2! in the total length. FRESH-WATER TROUT—FINS, SCALES, AND CiECA OF. 199 this fin is most developed in tliose taken from running waters.* Ventrals insertedIbeneatli tlie middle or last third of the base of the dorsal fin. Caudal forked inthe very young, emarginate in those of a medium size, becoming square in largeexamples, or even rounded, as shown in figure 46. While Yarrell (edition 3,p. 281) figured a Thames trout 28 in. long, and 11 lb. weight, in which the hindedge of this fin was slightly rounded. It would also ajipear that as a general rulethe tail fins of trout inhabiting rapid streams arc usually more deeply emaiginatedthan in specimens living in more stagnant Fig. 46. Tail fins of brook trout. 1, male, 5-6 in. long, from peatburn. 2, male, G-2 in. long, from peat burn. 3, female, G 7 in. long,from same place. 4, male, 8 in. long, Colesbourne. 5, male, 9-0 , Colesbourne. 6, female, 10-5 in. long, Lossie river. 7, female,12 in. long, Elgin. Tails of brook trout from New Zealand: 8, female,i natural size: 9, male, 20J in. long, J natural size : 10, male, 32i , ^ natural size. Scales.—From 12 to 15 rows are present between the hind edge of the adiposedorsal fin, in a line passing downwards and forwards to the lateral-line : whileabout 26 or 27 rows are present between the lateral-line and the base of the ventralfin. As regards the appearance of the scales I have had examples from ten racesof fresh-water and sea trout photographed under the microscope for comparisonone with another, and likewise examined many more, but the variations werefound to be so great, even in those from the same specimens,
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