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 FISHES zon fitfvia ti/is, Linn. Day (Fishes of Great Britain^ ii. 360, 361) says they are captured in the Thames, where they abound in quantities. Jenyns says (British Pert, jfnimak, p. 521) they are common in many of our rivers, especially in the Thames. Yarrell makes the same re- mark. They are stated to be very common in the Stour. Petromyzon branchialis, Linn. According to my experience this is rare in Essex. I have however observed it in the Colne in two localities. 229
 * 1 20. Lampern or Silver Lampern. Petromy-
 * I2I. Planer's Lamprey, Mud Lamprey.