Palaeontological study on the fish remains from the Palaeozoic and Mesozoic of Japan.

1)日本古生代鱼类化石分为29种，即泥盆纪板皮类1种，石炭-二叠纪板鳃类12种，石炭-二叠纪瓣齿类7种，石炭-二叠纪蜗齿类8种，二叠纪骨鱼类1种（Goto, 1996; 1997）。(2)日本中生代elasmobranch化石可划分为58种，即三叠纪下齿类3种，侏罗纪下齿类5种，白垩纪下齿类、拟齿类、衣壳类、六尾鱼类、异齿类、lamnoids、squaloids、pristiophoroids和sclerorhynchoids等50种（Goto el al., 1996; Goto, 1996）。3)据报道，大阪府海冢市Sobura的Izumi群（上白垩世）和熊本县天草郡Ryugatake的Himenoura群（上白垩世）中发现了两颗Chlamydoselachus sp.的牙齿（Goto et al., 1996; 1997）。4)描述了埼玉县东松山市久部仓古道组（中中新世）Carcharocles的牙齿（Yabe and Goto, 1996）。5)观察大白鲨7号*的牙齿、真皮牙、黏液牙的形态结构（Goto, 1996,1997; Yano et al., 1997）。(6)根据棘齿动物、鲨鱼、硬骨鱼类、两栖动物、爬行动物、哺乳动物和人类的进化等级，总结了脊椎动物牙齿和骨骼的起源和演化。

1) The Palaeozoic fish remains from Japan are classified into 29 species, that is, one species of Devonian placoderms, 12 species of Carboniferous to Permian elasmobranchs, seven species of Carboniferous to Permian petalodonts, eight species of Carboniferous to Permian cochliodonts and one species of Permian osteichthyans (Goto, 1996 ; 1997).(2) The Mesozoic elasmobranch remains from Japan are classfied into 58 species, that is, three species of Triassic hybodonts, five species of Jurassic hybodonts, and 50 species of Cretaceous hybodontoids, ptychodontoids, chlamydoselachoids, hexanchoids, heterodontoids, lamnoids, squaloids, pristiophoroids and sclerorhynchoids (Goto el al., 1996 ; Goto, 1996).3) Two teeth of Chlamydoselachus sp.are reported from the Izumi Group (Upper Cretaceous) of Sobura, Kaizuka City, Osaka Prefecture and the Himenoura Group (Upper Cretaceous) of Ryugatake, Amakusa-gun, Kumamoto Prefecture (Goto et al., 1996 ; 1997).4) The teeth of Carcharocles from the Godo Formation (Middle Miocene) of Kuzubukuro, Higashi-matsuyama City, Saitama Prefecture are described (Yabe and Goto, 1996).5) The morphology and structure of teeth, dermal denticles and mucous denticles of Megahasma pelagious No.7 * are observed (Goto, 1996, 1997 ; Yano et al., 1997).6) Origin and evolution of tooth and bone of vertebrates are summarized following the evolutionary grade of agnathians, sharks, bony fishes, amphibians, reptiles, mammals and humankind.