It is supposed to have acquired the name of Angel-fish, from its extended pectoral fins bearing some similarity to wings, certainly, as Mr. Yarrell has remarked, not for its beauty; and of monk-fish, from its rounded head, appearing as if enveloped in a monk’s hood. The skin is rather rough, and is used for polishing, and other works in the arts. Mr. Donovan says that the Turks of the present day make shagreen of it. [Illustration: THE SAW-FISH. (_Tristis antiquorum._)] THIS fish is found in the European and Atlantic seas. Its body is flattened anteriorly with four or five branchial openings below on each side; two spiracles behind the eyes; no anal fin; the head prolonged into a depressed bony beak, with strong pointed spines on each side; the lips are rough and sharp like a file, supplying the place of teeth. With its formidable weapon, which resembles a toothed saw, this fish attacks the largest whales, and inflicts very severe wounds. The colour of its body is of a greyish brown above, and paler below; its length about fifteen feet, the saw being about a third of the whole. [Illustration: THE LAMPREY. (_Petromyzon marinus._)] THE LAMPREY belongs to the last family of cartilaginous fishes, and is one of the lowest in the scale of vertebrated animals. It grows to the length of about three feet, although the British species, with which we are best acquainted, seldom exceeds twelve inches. To avoid the constant muscular exertions necessary to prevent their being carried away by the current, they attach themselves by the mouth to stones or rocks, and hence are called _Petromyzon_, Stone-suckers. The Lamprey, although no longer maintaining its ancient repute, is still considered a delicacy; those taken in the Severn being preferred to all others. Henry the First, as is well known, died of a surfeit of them; and in the reign of Henry the Fourth their importation was encouraged by immunities. The Roman epicures prized this fish so highly, that they bestowed the utmost care, and expended enormous sums in rearing them. Pliny tells us that Lucullus formed a fish-pond of such extent, that the fish it contained were, at his death, sold for four million sesterces. These polished barbarians sometimes threw a slave into the ponds where they kept their _Murœnæ_, or Lampreys, and considered that by this means they fattened the fish and gave them a superior flavour. [Illustration: THE HAG-FISH, (_Myxine glutinosa_,)]