Plate XXV. Physalia Arethusa
Illustrated by Auguste Sonrel (d. 1879)
Contributions to the Natural History of the United States of America, Volume IV
Part III. Discophoroe
Part IV. Hydroidoe
Part V. Homologies of the Radiata
Louis Agassiz (1807-1873)
Boston: Little, Brown and Company; London: Trübner & Co., 1862
Gould Library Special Collections
Because close and accurate observation of anatomical structures was central to the proper classification of species, detailed illustrations that accurately represented those structures were essential. This plate, which includes 17 complex figures, details both the anatomical structure and the development of Physalia Arethusa.