Fishes . olor, the belly as dark as the back,so as to form little contrast to the color of the shark. The commonest species, Leptecheneis naucraies, called pega-pega or pegador in Cuba, reaches a length of about two feetand is almost cosmopolitan in its range, being found exclusivelyon the larger sharks, notably on Carcharias lamia. It has 68o Gobioidei, Discocephali, and Taniosomi 20 to 2 2 plates in its disk, and the sides are marked by a duskylateral band. Almost equally widely distributed is the smaller remora,or shark-sucker {Eclioieis remora), with a stouter body andabout 18 plates in th
Fishes . olor, the belly as dark as the back,so as to form little contrast to the color of the shark. The commonest species, Leptecheneis naucraies, called pega-pega or pegador in Cuba, reaches a length of about two feetand is almost cosmopolitan in its range, being found exclusivelyon the larger sharks, notably on Carcharias lamia. It has 68o Gobioidei, Discocephali, and Taniosomi 20 to 2 2 plates in its disk, and the sides are marked by a duskylateral band. Almost equally widely distributed is the smaller remora,or shark-sucker {Eclioieis remora), with a stouter body andabout 18 plates in the cephalic disk. This species is foundin Europe, on the coast of New York, in the West Indies,in California, and in Japan, but is nowhere abundant. Anotherwidely distributed species is Remorina albescens with 13 platesin its disk. Remoropsis brachyptera, with 15 plates and a longsoft dorsal, is also occasionally taken. Rhombochirus osteochiris a rare species of the Atlantic with 18 plates, having the pec-. FiG. 593.—Rhontbochirus osteochir (Cuv. & Val.). Woods Hole, Mass. toral rays all enlarged and stiff. The louse-fish {Phtheinchthysliiieatus) is a small and slender remora having but 10 platesin its disk. It is found attached, not to sharks, but to barra-cudas and spearfishes. A fossil remora is described from the Oligocene shales inGlarus, Switzerland, under the name of Opisihomyzon glaronen-sis. It is characterized by the small disk posteriorly vertebrae are 10 +13 = 24 only. Dr. Storms gives the follow-ing account of this species: A careful comparison of the proportion of all the partsof the skeleton of the fossil Echeneis with those of the li\-ingforms, such as Echeneis nancraies or Eche)ieis remora, showsthat the fossil differs nearly equally from both, and that it wasa more normally shaped fish than either of these fonns. Thehead was narrower and less flattened, the preoperculum wider,but its two jaws had nearly the same length. The ribs, asalso the neura
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