Stuttgart & Tübingen, J. G. Cotta: vi + 182. 8 pls.

–Allen 920. Allen says "The historical introduction [3-20] traces briefly the history of the subject from the time of Aristotle to date, with copious references to the literature in foot-notes. Theil I [21-58] gives a carefully prepared synopsis of the species, with brief diagnoses, the principal synonymy, and references to the more important works relating to the species. Theil II [59-179] is devoted to a general account of the anatomy of the Sirenians and Cetaceans, largely from original investigation. The eight plates are based on material studied by the author."