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The present examples were obtained from the top of the Peng-shanian (late Upper Cambrian) at Nanshan, Chaumitien, Tsinan district,Shantung by the writer and the Class of 1923 of the National Universityof Peking in 1923 and by the writer and the Class of 1937 in 1935.
The present examples were obtained from the top of the Peng-shanian (late Upper Cambrian) at Nanshan, Chaumitien, Tsinan district, Shantung by the writer and the Class of 1923 of the National University of Peking in 1923 and by the writer and the Class of 1937 in 1935.