Fig. 7. Orthoceras chinense Foord. Nat. size p. 46 



7a. Longitudinal section of the large end of the shell, showing the septal 

 necks, septal distances and rate of tapering. 



7b. External view of same. The regular, flexuous, transverse strife are 

 plainly shown. 



7c. Cross section, showing the form of the shell and the position of the 

 siphuncle. 



Loc: — Near Sin-tan, Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2845) 



Fig. 8. Orthoceras suni Yii. Nat. size p. 56 



8a. Longitudinal section of the apical portion of the specimen, showing the 

 rate of tapering and septal distances. 



8b. Cross section, showing the sub-elliptical form of shell and the position 

 of the siphuncle. ^ 



Loc.:— Pei-yang-shan, Chung-yang-hsien, SE. Hupeh. (N. R. I. Cat. 

 No. 29) 



Fig. 9. Orthoceras suni Yii. Nat. size p. 36 



Natural section, showing the rate of tapering, septal necks and the 

 depth of camersu. 



Loc: — Pei-yang-shan, Chung-yang-hsien, SE. Hupeh. (N. R. L Cat. 

 No. 30) 



Fig. 10. Orthoceras? wongi Yii. Nat. size -. p. 60 



loa. Longitudinal section, showing the continuous septal necks, 

 lob. Cross section, showing the forms of both the shell and the siphuncle. 

 Loc:— Near Sin-tan, Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2853) 



(II) 91 



