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Quarterly Journal of Microscopical Science, Vol s2-84, 35-47, Copyright © 1942 by Company of Biologists
1 Department of Zoology, university of Melbourne
1. Although showing differences in the manner and time of its development, the dorsal organ of Campodea embryos is essentially the same type of organ as that of Symphyla and Collembola.
2. This must point to a close affinity between Symphyla, Collembola, and Entognatha; for in no representatives of any other group of Arthropoda has such an organ been found. Even in the apparently closely related Diplopoda there is no record yet of its presence, while in Pauropus the dorsal organ is of a different type.