Memoirs Read Before The Boston Society Of Natural History PDF Download

Excerpt from Memoirs Read Before the Boston Society of Natural History, Vol. 3: Being a New Series of the Boston Journal of Natural History; 1878-1894 From these observations, it will be seen that the muscular system of Distomum resem bles that of the Cestods more closely than it does that of the Planarians. But the exist ence of the single row of external longitudinal muscular fibres should be especially noted as bearing upon the homologies of the muscular layers of Plathelminths. This subject has been discussed in my paper (see above) in Semper's Arbeiten. It also overthrows, beyond all question, Schneider's1 attempt to classify worms according to their muscular systems, because some species of Taenia do, and others do not, have the external longitudi nal layer, and it is evident that orders and classes cannot be founded upon characters that are not constant within the limits of one genus.2. 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.