Appropriate submissions for The Bulletin of the Museum of Comparative Zoology and Breviora are original contributions concerned with systematics, evolutionary biology, ecology, and other aspects of organismal and comparative biology.

Longer contributions, those over 30 printed pages, should be published in the Bulletin; Breviora carries shorter papers. Both publications are issued at irregular intervals, mailed to domestic and foreign subscribers, and are automatically copyrighted with the Library of Congress.