. The Cambridge natural history. Zoology. XVII ELASMOBRANCHII—SELACHII 455 The more typical representatives of this family are the Spiny Dog-Fishes, which are distinguished by the presence of a strong spine in front of each dorsal fin. They are more abundant in temperate regions than in the intervening tropics. The more important genera are AcantMas,Ce7itri'na,Centroj>horus,Spinax,a,iid Centroscylliuvi. Acanthias vulgaris, the Picked or Piked Dog- Fish, is a gregarious, voracious Shark, about 3 to 4 feet in length, and is frequently seen in huge shoals all round the British coasts, especial
. The Cambridge natural history. Zoology. XVII ELASMOBRANCHII—SELACHII 455 The more typical representatives of this family are the Spiny Dog-Fishes, which are distinguished by the presence of a strong spine in front of each dorsal fin. They are more abundant in temperate regions than in the intervening tropics. The more important genera are AcantMas,Ce7itri'na,Centroj>horus,Spinax,a,iid Centroscylliuvi. Acanthias vulgaris, the Picked or Piked Dog- Fish, is a gregarious, voracious Shark, about 3 to 4 feet in length, and is frequently seen in huge shoals all round the British coasts, especially during the summer months. It is very destructive to food Fishes, and its ravages result in serious loss to fishermen. Acanthias is viviparous. Ce^itrina salviani is a much smaller Shark, which frequents the Mediterranean and the Bay of Biscay; on rare occasions it has been taken off the southern coast of England. Centropliorus occurs in deep water in the Mediterranean and adjacent portions of the Atlantic, and off the coasts of Japan. Centj-oscyllium is found on opposite sides of the North Atlantic (Greenland and Massachusetts), and in the opposite hemisphere at the Falkland Isles. A deep-water form. FaracentroscyIlium, has been obtained in the Bay of Bengal at depths from 285 to 405 fathoms.^ Three remaining genera {Scymnus, Laeraargus, and Hchino- rhinus) differ from the preceding in the absence of dorsal spines. Scymnus lichia is common in the Mediterranean and the neigh- boi^ring parts of the Atlantic. The Greenland Shark {Laemargus. Fig. 260.—The Greenland Shark (Laemargus honalis). (From Goode and Bean.) lorealis) (Fig. 260) is an inhabitant of the Arctic regions, wander- ing as far southwards on opposite sides of the Atlantic as the French coast and Cape Cod. It is a huge, clumsy shark, reaching a length of 26 feet. Numerous instances are recorded of its capture off the coasts of Great Britain, especially in northern waters. The Greenland Shark is said to be a det
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
