. British and Irish Salmonidæ. fins graduatedtowards those of the brook trout: the length of the head of a local example ofmale brook trout was one-fifth of the entire length of the fish, whereas in thesewhitlings it varied from 4i to 5 J in the total : the lower limb of the prcopercle inall but one was very short, when the adipose or dead fin was orange the pectoralwas light coloured : and the anterior-superior margin of the back fin from beingnearly black in some had a white margin in others, while in two there was abso-lutely no black spots at all on this fin. As to the vomerine teeth,* in
. British and Irish Salmonidæ. fins graduatedtowards those of the brook trout: the length of the head of a local example ofmale brook trout was one-fifth of the entire length of the fish, whereas in thesewhitlings it varied from 4i to 5 J in the total : the lower limb of the prcopercle inall but one was very short, when the adipose or dead fin was orange the pectoralwas light coloured : and the anterior-superior margin of the back fin from beingnearly black in some had a white margin in others, while in two there was abso-lutely no black spots at all on this fin. As to the vomerine teeth,* in all a rowwas present along the hind margin of the head of that bone, and in a more orless complete zig-zag line along its body (see fig. 29, no. I, p. 156). The ca?calappendages averaged 53, but were of varying numbers fi-om 40, 40, 42, 43, 4G,50, 60. In the one in which the vertebroe were examined, there were 58 -(- x. Itmust be evident that in this series we have evidence of a gradual approach fromthe sea to the river Fig. 31. Head, natural size, of female Seiiin or southern race. The race of sea trout generally considered as more exclusively our southernand Irish onef has been subdivided by authors in accordance with its size, sex,external appearance, and the number of teeth existing on the body of the vomer. • Parnell observed of the vomerine teeth that they are from nine to twelve in number, andin about one example out of twenty only three of these teeth are perceptible, and these confinedto the most anterior part (p. 29(>). f Donovan, in his Iour in Soutli Wales and ilonmouthxhirc, drew attention to this form, whichho termed Salmo camhrkus (for synonymy, see p. 150 ante), observing ou its appearing on the seacoast and in the rivers of Wales during the summer months, from May to September, and thenreturning to the sea. In tlic Reiwrt of the Conmtissioyicrs appointed to inquire into the f^almon Fislieries of England SEA TROUT—SEWIN, ITS NAMES. 161 >Bull t
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