PLATE V. 



Fig. I. V aginoceras peiyangense Y'i. x - P- 35 



la. Natural polished section, showing the rate of tapering and the 

 ectoseptal distances. 



lb. Longitudinal section of the broken apical portion of the same specimen, 

 showing the endoconch and the endocylinder. The section is slightly 

 oblique to the dorso-ventral diameter. 



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



No. 9) 



Fig. 2. V aginoceras peiyangense Yti. Nat. size p. 35 



2a. Longitudinal section with a portion of endoconch and some tubi 

 adhering to it at the lower part of the specimen. 



2b. Cross section, showing the position and form of endoconch. 



Loc: — He-chiao, Chung-yang-hsien, SE. Hupeh. (N.R.L Cat. No. 10) 



Fig. 3. V aginoceras chientzekouense Yii. Nat. size p. 38 



Longitudinal section, showing the endocylinder and the ectosepta. 



The section is nearly normal to the dorso-ventral diameter of the 

 shell. 



Loc: — Chien-tze-kou, Nan-chang-hsien, N. Hupeh. (N.R.L Cat. No. 12) 



Fig. 4. V aginoceras uniforme Yii. Nat. size p. 42 



4a. Longitudinal section, showing the uniformity of the ectoseptal dis- 

 tances. 



4b. Cross section with a submarginal endoconch. 



Loc: — Near Ta-fang village, Yang-sin-hsien, E. Hupeh. (G.S.C. Cat. 

 No. 2840) 



Fig. 5. V aginoceras multiplectoseptatum Yii. Nat. size p. 44 



Longitudinal section, showing the numerous ectosepta and the 

 marginal endoconch. 



Loc: — Near Sin-tan, Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2841) 



Fig. 6. V aginoceras multiplectoseptatum Yii. Nat. size p. 44 



External view of a weathered specimen, showing the multiple ectoseptal 

 sutures and the rate of tapering. 



Loc: — Near Sin-tan. Tze-kuei-hsien, W. Hupeh. (G.S.C. Cat. No. 2842) 



(II) 90 



