Fig. 7. Quadraticephalwi .' con^rexas Sun p. 63 



7 fragmentary cranidium x 2 



Uppermost Cambrian, Kaolishan formation, Kao-Li-Shan, Tai-An, 

 Shantung (Coll. Y. C. Sun. Holotype., G. S. Ch. Cat. No. 595.). 



Fig. 8. Ptychaspis chinhdensis Sun p. 64 



8a broken cranidium x 3 8b broken cranidium x 2 



8c broken cranidium x 1-^ 8d associated hypostoma x 3 



8e associated free cheek x 3 8f associated pj'^gidium x 3 



Upper Carnbiian, Shakuotun limestone, Sha-Kuo-Tun, Chin-Hsi- 



Hsien, Fengtien (Coll. .J. G. And^rsson. Cotypes G. S. Ch. Cat. Nos. 596, 



597, 598, 599, 600, GOl.). 



— 105 — 



