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SMITHSONIAN MISCELLANEOUS COLLECTIONS
VOLUME 57, NUMBER 13
CAMBRIAN
GEOLOGY AND PALEONTOLOGY
II
No. 13.—DIKELOCEPHALUS AND OTHER GENERA
OF THE DIKELOCEPHALINÆ
(With Plates 60 to 70)
BY
CHARLES D. WALCOTT
(Publication 2187)
CITY OF WASHINGTON
PUBLISHED BY THE SMITHSONIAN INSTITUTION
APRIL 4, 1914
