Yarrell states that formerly the Thames alone supplied from i,000,000 to 1,200,000 lamperns annually, but their number has so much fallen off that, for instance, in 1876 only 40,000 were sold to the codfishers.
That year, however, was an unusually bad year; the lamperns, from their scarcity, fetched £8, ios.
Miller discovered that they undergo a metamorphosis, and that the minute worm-like lamperns previously known under the name of Ammocoetes, and abundant in the sand and mud of many streams, were nothing but the undeveloped young of the river-lampreys and small lamperns.
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