. 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
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Keywords: ., bookcentury1800, bookdecade1880, bookidbritishirish, bookyear1887
