CONTENTS {Continued) 



Orthoceras densumYu (sp.nov.) 58 



Orthoceras yangtzeenseYu {sp. nov.) 59 



Orthoceras ? wongi Yii (sp. nov.) 60 



Orthoceras sp 60 



Orthoceras sp 61 



Genus Protocycloceras Hyatt 62 



Protocycloceras deprati Reed 62 



Genus Cycloceras M'coy 63 



Cycloceras sp 63 



Genus Discoceras Barrande 64 



Discoceras eurasiaticum Freeh . . . . 64 



Genus Lituites Brogniart 65 



Lituites lit Yii (sp. nov.) 65 



Genus Oncoceras Hall 66 



Subgenus Meloceras Hyatt 66 



Meloceras asiaticum Yabe 66 



Bibliography '. • • • . 68 



Explanation of plates 73 



(II) 3 



