PLATE I. 



Cambrian Braehiopoda etc. frcnn North China. Drawings hij K. C. Liu (f'J^ 



Fig. 1. Clonograptusf caynb ri a Snn p. 15 



1 one stripe x 3 



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

 Shantung (Coll. K. W. Hsu. Holotype, G. S. Ch. Cat. No. 629). 

 Fig. 2. Climacfichnites maihieui Sun p. 16 



2 an impression of the trails on the under side of the roclc, show- 

 ing the character in relief. 



Lower Cambrian, Manto shale, Luan-Chou, Cliihli (Coll. F. F. 

 Mathieu. Holotype, Cr. S. Ch. Cat. No. 630) . 



Fig. 3. Obolu>t (Westonia) leei 8nn p. 17 



3a exterior of the ventral valve x 3 

 3b counter-part of the same x 3 

 3c portion of the surface character 8 times enlarged. 

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

 Mathieu. Holotype, G. S. Ch. Cat. No. 631). 



Fig. 4. Obolus mollisonensis Walcott (?) p. 17 



4a crushed valve x 4 4b crushed valve of another individual x 4 

 Early Upper Cambrian, Changshan Shale, Jen-Chuang, Luan-Hsien, 

 Chihli (Coll. A. W. Grabau, F. F. Mathieu, G. S. Ch. Cat. No. 632 a, b). 



Fig. 5. Obolus liny uensis Sun p. 18 



5 exterior of ventral valve x 6 



Lower Cambrian, Manto Shale, Hung-Shan-T'ou, Lin-Yu-Hsien, 

 ChihU (Coll. University Expedition. Holotype, G. S. Ch. Cat. No. 633). 



Fig. 6. Obolus ta ianensis Sun p. 19 



6a one portion of limestone with several individuals of this species, 

 natural size (Paratypes and Holotype) . 



6b one valve enlarged x 5. (Holotype) . 



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

 Shantung (Coll. Y. C. Sun. Cotype, G. S. Ch. Cat. No. 634). 



Fig. 7. Obolus luanhsiensis (rrabau p. 19 



7a exterior of a ventral valve x 3 

 7b exterior of another valve x 3 

 7c exterior of the crushed ventral valve x 3 



Upper Cambrian, Fengshan limestone, Yeh-Li, Luan-Hsien, Chihli 

 (Coll. H. C. Tan. Cotypes, G. S. Ch. Cat. Nos. 635, 636, 637) . 



