A treatise on zoology . hem and the next Order in some respects. The remarkable genus ThoracopAerus, with huge pectoral fins anda large and powerful ventral lobe of the caudal fin, was a flying fishof the Triassic age. Gi(iantopterus, of similar form, is closeh allied(Abel[l]). Pholidophoras, Ag.; Triassic and Jurassic, Europe ; Trias, , Bronn; Gigantop)terus, Abel; Pcltopleimis, Kner; Trias,Europe. PleurophoUs, Eg. ; Jurassic, Europe. AM JO I DEI Zll Family Archaeonemidak. Differing from tlie last in the possessionof thin cycloid scales, and ridge scales along the mid-
A treatise on zoology . hem and the next Order in some respects. The remarkable genus ThoracopAerus, with huge pectoral fins anda large and powerful ventral lobe of the caudal fin, was a flying fishof the Triassic age. Gi(iantopterus, of similar form, is closeh allied(Abel[l]). Pholidophoras, Ag.; Triassic and Jurassic, Europe ; Trias, , Bronn; Gigantop)terus, Abel; Pcltopleimis, Kner; Trias,Europe. PleurophoUs, Eg. ; Jurassic, Europe. AM JO I DEI Zll Family Archaeonemidak. Differing from tlie last in the possessionof thin cycloid scales, and ridge scales along the mid-dorsal and ventrallines. Archaeonemus, A. S. W. ; Jurassic, Wales. Family Oligopleuuidae. In these the ganoine is vestigial, the scalestil in, overlapjjing, and more or less rounded, the centra annular oramphicoelous, and generally well ossified. The first centrum has twodisks. Oligoplcarns, Thiol. ; Jurassic, Europe. ^, Costa ; Jurassicand Cretaceous, Europe, ^pathiurux, Davis ; Cretaceous, Mt. Fiortion of vertebral column of Coelodus, .showingthe persistent iiotuchord (shaded) and the expanded bases of the neural and haemal arches ; c,the same of Fiicimihi.: ; ,/; inner view of scales, showing mode of interlocking by pegs andsockets, continued as longitudinal ribs. (After J. J. Heckel, from A. S. Woodward.) Family Pycnodoxtidae. This is a highly specialised family of deep-bodied compressed fish found in deposits from the Lower Lias to theEocene. The dorsal and anal fins are greatly extended backwards, thepectorals small, and the pelvics vestigial (Fig. 319). The caudal fin,externally symmetrical, is of the abbreviate heterocercal type and oftenstrongly forked. Fulcra are absent or vestigial. The scales are rhombicbut greatly lengthen
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