Book excerpt: Excerpt from Studies on the Cyclostomata Operculata Many years ago I undertook a study of the Danish cretaceous Bryozoa the results of which have not yet been published, and among the species studied by me were also a small number belonging to the family Melicerititidae (eleidae d'orb.) to the members of which d'orbigny ascribes a calcareous operculum the presence of which, however, has been denied by all the later authors who interprete the supposed Operculum as a closure-plate of the same nature as that which has been found both in the Cyclostomata and the Cheilosiomata. I came however to the result that d'orbigny was right in his interpretation of the named structure, and I have published some remarks on this subject in my preliminary communication ”studies on BryozoaAbout 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.