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 A HISTORY OF SUFFOLK CYCLOSTOMES •*II5. Sea Lamprey. Petromyzon marinus, *ii6. Lampern or River Lamprey. Petromyzon Linn. JluviatiliSy Linn, According to Lowe this species is abundant in Occurs in Norfolk in the Ouse, and perhaps the Yare in April and May, when numbers in Suffolk rivers, but is not recorded, ascend the river to breed; it probably occurs *^^^ Planer's Lamprey. Petromyzon branchialis, also in the Wavcney, and perhaps in other Suf- Linn. rivers. Occurs in Norfolk according to Lowe and therefore probably in Suffolk, but not recorded. 172