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Distinctive features of these little sharks are that they have five pairs of gill openings and an anal fin; that at least one-half of the base of the first dorsal fin is rearward of the point of origin of the pelvic fins; that the front margin of the nostrils does not bear a fleshy barbel; and that they lay eggs with horny shells and tendrils at the corners. Many species are known. The familiar spotted dogfishes of European seas (two species) fall in this group. And one species calls for mention here.