. British and Irish Salmonidæ. Fig. 3G. 1. Anal fin of sewin with 12 rays. 2. Anal fin of sewin mth 10 rays. tions. Anteriorly they are single and undivided, and three or sometimes fourin number. The pos-terior rays are divi-ded, the last nearlyas low as its base;of these from sevento nine may bopresent: the twoshown in fig. 36are from Welsh ex-amples. As regardsthe form of the cau-dal fin,* figure 37shows outline trac-ings from sevenspecimens of Truff,White - fish andWelsh sewin, show-ing how exceedinglyvariable the depthof the cleft may be, atleast in fishes up to15 inches in the
. British and Irish Salmonidæ. Fig. 3G. 1. Anal fin of sewin with 12 rays. 2. Anal fin of sewin mth 10 rays. tions. Anteriorly they are single and undivided, and three or sometimes fourin number. The pos-terior rays are divi-ded, the last nearlyas low as its base;of these from sevento nine may bopresent: the twoshown in fig. 36are from Welsh ex-amples. As regardsthe form of the cau-dal fin,* figure 37shows outline trac-ings from sevenspecimens of Truff,White - fish andWelsh sewin, show-ing how exceedinglyvariable the depthof the cleft may be, atleast in fishes up to15 inches in the extent of thecleft in the northernform been invariablyat about what isshown in nos. 4, 6,and 8 in figure 30(see page 156) onewould be tempted tobelieve that a spe-cific difierence mightbe seen in theamount of excisionin this fin. But ex-tending our inquiries. Fig. fins of female sea trout. 1. Seiein, 6-8 in. long, Tni/, 8-2 in., Dart. 3. IVIiite-Jish,12-im.,Teif!,n. 4. Sewin,12-6 in., Towy. 3. Seioin, 13-3 in., Dysiuni. 0. White-fish,13 in., Teign. 7. Sewin, 15-1 in. Towy. * Yarrell observed that in old examples the tail became convex and gave a figure of such afish, which he termed a Round tail, also a Sewin taken from a male specimen 32 inches inlength. Giinther asserted that the caudal fin is forked in specimens 6 inches long ... it showsonly a slight emargination in specimens in the grilse stage, and is perfectly truncate in adultexamples, but never rounded (Catal. vi, p. 35). 11 * 164 SALMONIDJH OF BRITAIN. demonstiates that similar variations are perceived in the norttem nice, as no. 7 intlic same figure, where the cleft of this fin from a Suthei-landshire osamiilc (fromthe Oykell), is as great as in any southern specimen of sewin. Although ithas been asserted that in Wales the difference in the tails of the sewin and
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