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Excerpt from The Structure and Relationships of the Primitive Devonian Lungfish, Dipnorhynchus Sussmilchi (Etheridge) In 1936 Hills described the external dermal bones of a mandible from Buchan, Victoria, as a probable representative of Dipnorhynchus. A large part of the ex ternal surface had been lost before it came to the National Museum, Melbourne, where it is now housed (p However, interpretation was possible because an impression of the radiating structure of the internal surfaces of the dermal bones had been left on the matrix filling the Meckelian vacuity. Permission was obtained from E. D. Gill, Deputy Director of the National Museum, to prepare this speci men by acid etching after the above-mentioned structures had been recorded in plaster casts. Not only were the internal elements of the mandible found to be almost complete and uncrushed, but the cavities of the jaw contained a large cheek plate (p is837a, National Museum), several scales (p i38s7e-f), and a portion of the branchial apparatus (p 13837g). Neither the exact locality nor horizon of this specimen is known. Attempts to identify the horizon by recovering microfossils from the acid residues were unsuccessful. 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.

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