EXPLANATION OF PLATE I.— (Continued) 



Fig. 10. Orthis neichiaensis Chang P. 11 



10a Interior mold of the pedicle valve. Nat. size. 

 10b Same valve x 3. 



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

 (G. S. C. Cat. No. 3373). 



Fig. 11. OrfMs neichiaensis Chang P. 11 



11a Exterior impression of another pedicle valve. Nat. size. 

 lib Gutta percha mold of sajne valve. 

 llc = lla X 2. 

 lld = llb X 2. 



Loc: — Taihimgshan, Nanchang Hsien, N. Huijeh. 

 (G. S. C. Cat. Nos. 3374a, 3374b). 



Fig. 12. Orthis ellipsoides Chang P. 13 



12a Exterior imjjression of the Pedicle valve x 2. 

 12b Interior mold of the pedicle valve x 2. 

 12c Interior mold x 4. 

 12d Exterior impression x 4. 



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

 (G. S. C. Cat. Nos. 3375, 3376). 



(ill) 24 



