PLATE I. 



Fig. I. Cameroceras cf. styliforme Grabau. Nat. size p. 23 



View of a portion of the endoconch embedded in rock. 



Loc: — Lo-jo-ping, I-chang-hsien, W. Hupeh. (G. S. C. Cat, No. 2826) 



Fig. 2. Cameroceras cf. styliforme Grabau. Nat. size p. 23 



2a. External view of endoconch, showing the oblique ectoseptal edges on 

 the external surface of the endotheca. 



2b. Cross section of the\same specimen, showing older endosepta, the 

 aperture of the endocone and the form of the endoconch. 



Loc: — Lo-jo-ping, Lchang-hsien, W. Hupeh. (G. S. C. Cat. No. 2827) 

 Fig. 3. Cameroceras cf. styliforme Grabau. Nat. size p. 23 



Longitudinal section of an endoconch, showing the endosepta. 



Loc: — Lo-jo-ping, I-chang-hsien, W. Hupeh. (G. S. C. Cat. No. 2828) 

 Fig. 4. Cameroceras hsiehi Yii. Nat. size p. 25 



4a. Longitudinal section, showing the endotheca, last endoseptum, 

 endocone and ectosepta. 



4b. Cross section of same, showing the circular endoconch which is in 

 juxtaposition with the ectoconch. 



Loc: — Near Sin-tan, Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2831) 

 Fig. 5. Cameroceras subtile Yii. Nat. size p. 26 



5a. Longitudinal section of a mature portion, showing the endotheca and 

 the nature of stereoplasmic deposit in the camerfe. 



5b. Cross section, showing the excentric endoconch. 



Loc: — near Sin-tan, Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2832) 



Fig. 6. Endoceras leei Yii. Nat. size p. 28 



A natural weathered section, showing the tubi, one camera in 

 length, and the acute apical angle formed bj' the endosepta. 



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



No. i) 



Fig. 7. Endoceras leei Yii. Nat. size p. 28 



7a. Natural polished section, showing the length of tubi and the last 

 endoseptum. The endoconch is wholly filled with calcite deposit. 



(II) 74 



