Fishes . , sometimes striped with of the species belong to the genus Polydactylus. Poly- -li Percesoces and Rhegnopteri 441 dactylus vtrginicus, the barbudo, with seven filaments, is commonin the West Indies and Florida. Polydactylus octonemus witheight filaments is more rare, but ranges further north. Poly-dactylus approximans, the raton of western Mexico, with sixfilaments, reaches San Diego. Polydactylus plebejus is commonin Japan and other species range through Polynesia. In Indiaisinglass is made from the large air-bladder of species of Poly-dactylus. The rare Polynemus quinqua
Fishes . , sometimes striped with of the species belong to the genus Polydactylus. Poly- -li Percesoces and Rhegnopteri 441 dactylus vtrginicus, the barbudo, with seven filaments, is commonin the West Indies and Florida. Polydactylus octonemus witheight filaments is more rare, but ranges further north. Poly-dactylus approximans, the raton of western Mexico, with sixfilaments, reaches San Diego. Polydactylus plebejus is commonin Japan and other species range through Polynesia. In Indiaisinglass is made from the large air-bladder of species of Poly-dactylus. The rare Polynemus quinquarius of the West Indieshave five pectoral filaments, these being greatly elongate, muchlonger than the body. No extinct Polynemidce are Fig. 348a.—Striped MuUet, Mugit cephalus (L.). Woods Hole, Mass. CHAPTER XXVIII
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