Excerpt from Studies in Evolution: Mainly Reprints of Occasional Papers Selected From the Publications of the Laboratory of Invertebrate Paleontology, Peabody Museum, Yale University Page 1. Outline OF A natural classification OF the trilobites Continued Family XIII. Cheiruridae Family XIV. Phacopidae References List of Genera 2. The systematic position OF the trilobites 3. The larval stages OF trilobites Introduction The Protaspis. Review of Larval Stages of Trilobites Analysis of Variations In Trilobite Larvae Antiquity of the Trilobites Restoration of the Protaspis The Crustacean N auplius Summary References 4. ON the mode OF occurrence, and the structure and development or triarthrus beck] 5. Further observations ON the ventral strug ture OF triarthrus. Paired Uniramose Appendages Anterior Antennae, or Antennules Paired Biramous Appendages First Pair of Biramous Appendages, or Posterior Antennae Second Pair of Biramous Appendages, or Mandibles Third and Fourth Biramous Appendages, or Maxillae Thoracic Legs Organs In the Median Line The Hypostoma The Mouth The Metastoma The Anal Opening Observations Summary of Ventral Organs of Triarthrus 6. The morphology OF triarthrus References 7. Structure and appendages or trinucleus Appendages Endopodites Exopodites. 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.