The Appendages of Ptychoparia. The Appendages of Calymene and Ceraurus. Comparison of the Appendages of Calymene and Ceraurus with those of Triarthrus. The Appendages of Cryptolithus. Summary on the Ventral Anatomy of Trilobites. PART II. Structure And Habits Of Trilobites. Primitive Characteristics of Trilobites. The Ancestor of the Trilobites, and the Descent of the Arthropoda. Cryptolithus tessellatus Green. Many figure captions contain size references (i.e., × 6) these should be taken as an approximate guideline as the displayed images most likely will not match the size of the originally printed versions due to a number of factors (monitor resolution, chosen display size in browser, etc.). VOLUME VII DECEMBER, 1920 The Appendages, Anatomy, and Relationships |