Excerpt from Contributions to the Natural History of the United States of America, Vol. 4: Second Monograph, in Five Parts: I. Acalephs in General; II. Ctenophorae; III. Discophorae; IV. Hydroidae; V. Homologies of the Radiata Section 6. Habits of Aurelia - Its appearance in the spring and disappearance in the autumn; passes the winter in a larval condition. P. 75 - 78. Section 7. Nomenclature of Aurelia - The young and the adult, in various states of preservation, referred to many genera, supposed to be distinct, but all of which must now be suppressed. P. 78 and 79. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.