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 A HISTORY OF HERTFORDSHIRE 11. Rudd. Leuciscus erytbrophtkalmus, Linn. 12. Roach. Leuciscus rutilus, Linn. 13. Dace. Leuciscus dolnila, Linn. (L. vul- garly Day). 14. Minnow. Leuciscus phoxinus, Linn. 15. Tench. Tinea vulgaris, Cuv. Like the carp, more confined to still waters. 1 6. Bream. Abramis brama. Linn. Recorded from the Lea and the lower reaches of the Gade. 17. White Bream. Abramis blicca y Bl. From the Lea. 1 8. Bleak. Alburnus lucidusj Heck. & Kner. Recorded from the Lea and the Bulbourne. The ' Fresh-water Sprat ' of Izaak Walton. 19. Loach. Nemacbilus barbatula, Linn. Recorded from the Lea, the Bulbourne and the Gade. MALACOPTERYGII 20. Salmon. Salmo salar, Linn. Was probably extinct as a Hertfordshire fish before the end of the eighteenth century. Its presence in the Lea is last mentioned in 1735 by Farmer, in his Abbey of Waltham. The Lea Conservancy forbid the capture of any salmon of less than 4 Ib. weight. 21. Trout. Salmo trutta, Linn. The small brown trout are found in most rivers. A fine salmon-trout was reported to have been taken from the Lea in 1856. 22. Grayling. Thymallus vexillifer t Linn. It is doubtful whether this fine fish now occurs in any Hertfordshire river. Several attempts have been made to reintroduce it both into the Colne and the Lea, and various reports as to its being on the increase or the reverse have been made. APODSS 23. Eel. Anguilla vulgaris, Turt. CYCLOSTOMES 24. Lampern. Petromyzon fluviatilis, Linn. Recorded from the Lea and the Gade ; said to be tolerably abundant. 190