Fig. 8. Lingulella dimoi'pha Sun p. 20 



8a exterior of the shell from Luan-Chou x 3 (Holotype) . 



8b exterior of the shell from Yeh-Li x 3 (Paratype) . 



8c portion of the shell of Fig. 8a enlarged x 8, showing its undulating 

 growth lines. 



Upper Cambrian, from Fengshan limestone (Coll. F. F. IMathieu 

 and Y. C. Sun. G. S. Ch. Cat. Nos. 638, 639.). 



Fig. 9. Lingulella liui Sun p. 2] 



9a exterior of a ventral ? valve x 6 ; 9b exterior of a dorsal ? valve x fi 

 9c exterior of another ventral? valve x 6 



Cambrian from purple shale of Luan-Chou, Chihli (Coll. F. F 

 Mathieu. Cotypes, G. S. Ch. Cat. Nos. 640, 641, 642.). 



Fig. 10. Lingulella Jcayseri Grabau p. 22 



10a exterior of a characteristic shell x 3 

 10b exterior of a slightly larger shell x 3 

 10c exterior of an imperfect shell x 3 



Upper Cambrian, Fengshan limestone, Yeh-Li, Chihli (Coll. H. C. 

 T'an. Cotypes, G. S. Ch. Cat. Nos. 643, 644, 645.). 



Fig. 11. Acrothele clieni Sun p. 23 



11a external mold of a crushed valve x 2 



lib an imperfect crushed valve x 2 (the figure is drawn somewhat 

 too narrows) . 



Late Lower Cambrian, from Manto Shale, Cheng-Shan, Luan-Hsien, 

 Chihli (Coll. S. Chen. Cotypes G. S. Ch. Cat. Nos. 646, 647.). 



Fig. 1 2. Nissusia hayasakai Sun p. 23 



12 exterior of the brachial valve x 3 



Middle Cambrian, from Changhia limestone, Cheng-Shan, Luan- 

 Hsien, Chihli (Coll. K. S. Hsu. Holotype, G. S. Ch. Cat. No. 64rt ). 



Fig. 13. Eoorthis shakuotunensis Sun p. 24 



13a exterior of a pedicle valve x 2| 

 13b interior of another pedicle valve x 2 



Upper Cambrian, from Shakuotun limestone, Chiu-Hsi-Hsien, 

 Fengtien (Coll. J. G. Andersson. Cotypes, G. S. Ch. Cat. Nos. G49, 650.). 



b'^ig. 14. Syntrophia orthia Walcott P- 25 



14a exterior of the pedicle valve x 5 

 14b interior of the pedicle valve x 3 



Upper Cambrian, Kaolishan limestone, Kao-Li-Shan, Tai-An, Shan- 

 Tung (Coll. Y. C. Sun. Plesiotypes G. S. Ch. Cat. Nos. 651, 652.). 



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