Fig. r>. niacJrwelderia .s^r/^ens/s var. linchevgensis Sun ...p. 33 



6a fragmentary cranidiam x 2 

 6b associated pygidium probably of this species x 3 

 6c cranidiura x 2 6d cranidium x 2 



Middle Cambrian, Kushan formation, Lin -Cheng, Chihli (Coll. Y, 

 T. Chao & C. 0. Tien. Cotypes, G. S. Ch. Cat. Nos. 523 a-b 524, 525). 



Fig. 7. Blachvelderia tieni Sun .- p. 36 



7a fragmentary cranidium x 2 

 7b associated free cheek x 2 

 7c associated pygidium x 2 



^Middle Cambrian, Kushan formation, Lin-Cheng, Chihli (Holotype 

 G. S. Ch. Cat. No. 526.). 



Fig. 8. Blackwelderia gigas Sun p. 37 



8a large pygidium, natural size. 



Late jMiddlQ Cambrian, Kjashan formation, Ku-Shan, Shantung. 

 (Coll. C. C. Tien & Y. T. Chao. Holotype, G. S. Ch. Cat. No. 527.). 

 Fig. 0. Damesella blachoelderi var. minor &un p. 38 



9a cranidium x 4 9b cranidium x 6 



Middle Cambrian, Changhia limestone, Cheng-Shan, Ctiihli (Coll. 

 K. S. Hsu. Cotypes G. S. Ch. Cat. Nos. 528, 529.). 



9c (D. hlackv) elder i) Natural size, for comparison, Kushan form- 

 ation of Shantung. Cat. No. 530.) 



Fig. 10. Ptychoparia fongi Sun p. 40 



10a cranidium x 3 10b cranidium x 3 

 Late Lower Cambrian, Manto formation, Cheng-Shan, Cliihli 

 (Coll. Y. C. Sun & S. S. Yoh. Cotypes, G. S. Ch. Cat. Nos. 531, 532.). 

 Fig. 11. Ptychoparia leichuangensis Sun p. 41 



11a cranidium x 10 lib cranidium x 8 



Late Lower Cambrian, Manto Shale, Lei-Chuang, Luan-Chou (Coll. 

 F. F. Mathieu. Cotypes, G. S. Ch. Cat. No. 533, 534.). 



Fig. 12. Ptychoparia yohi Sun P- 42 



12 cranidium x 3 



Late Lower Cambrian, Manto Shale, Cheng-Shan, Chao-Kou- 

 Chuang, Chihli (Coll. Y. C. Sun. Holotype, G. S. Ch. Cat. No. 535.). 



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