7a. Longitudinal section, showing the deep camerae, the short septal necks 

 and the gentle rate of tapering. 



yh. Cross section. 



Loc: — Near Sin-tan, Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2850) 



Fig. 8. Orthoceras rudum Yii. Nat. size p. 55 



8a. Longitudinal section, showing the septal necks and the septal distances. 



8b. External viev^ of the same specimen, showing the lines of growth. 



8c. Cross section. 



Loc: — Near He-chiao, Chung-yang-hsien, SE. Hupeh. (N. R. L Cat. 

 No. 26) 



(II) 87 



