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Beecher, C: Studies in Evolution

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O knihe

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.

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