EXPLANATION OF PLATE I. 



Fig. 1. Lingula sp P- "^ 



la Pedicle valve. Nat. size. 

 lb Same valve x 4. 



Log: — Taihungshan, Nanchang Hsien, N. Hupeh. 

 (G. S. C. Cat. No. 3363). 



Fig. 2. Orthis calligramma Dalman, var. sinensis Chang P 7 



2a Internal mold of the pedicle valve. Nat. size. 

 2b Same mold x 2. 



Log: — Taihungshan, Nanchang Hsien, N. Hujjeh. 

 (G. S. C. Cat. No. 3364). 



Fig. 3 Orthis calligramuba Dalman, var. hupehensis Chang P. 8 



3a External impression of the pedicle valve of the holotype. Nat. size. 

 3b Gutta percha mold of same valve. 

 3c = 3a X 2. 

 3d = 3b X 2. 



Loc: — Taihungshan, Nanchang Hsien, N. Hupeh. 

 (G. S. C. Cat. Nos. 3365a, 3365b). 



Fig. 4. Orthis calligramma Dalman, var. hupehensis Chang P. 8 



4a External impression of another pedicle valve. Nal. size. 

 4b Gutta percha mold of same valve. 

 4c = 4a X 3. 

 4d = 41j X 3. 



Loc: — Taihungshan, Nanchang Hsien, N. Hupeh 



(G. S. C. Cat. Nos. 3366a, 3366b). 



Fig. 5. Orthis curausii Salter, var. nanchang hsiens is Chang P. 9 



5a Exterior im])ression of the brachial valve. Nat. size. 

 5b Gutta percha mold of same valve. 

 5c = 5a X 2. 

 5d-5b X 2. 



Loc: — Taihungshan, Nanchang Hsien, N. Hupeh. 

 (G. S, C. Cat. Nos. 3367a, 3367b). 



(in) 22 



