ILLUSTRATIONS 



LIST OF PLATES 



I. Spines of Radiolaria. 



II. Classification of Trilobites. 



III. Larval Stages of Trilobites. 



IV. Larval Stages of Trilobites. 

 V. Crustacean Larvae. 



VI. Appendages of Triarthrus. 



VII. Ventral Side of Triarthrus. 



VIII. Appendages of Triarthrus. 



IX. Triarthrus. 



X. Appendages of Trinucleus. 



XI. Stages of Growth of Brachiopoda. 



XII. Stages of Growth of Brachiopoda. 



XIII. Parallelism in Brachiopoda (Magellania Series). 



XIV. Ontogeny and Phylogeny of the Terebratelliche. 

 XV. Stages of Growth in Silurian Brachiopoila. 



XVI. Stages of Growth in Silurian Brachiopoda. 



XVII. Stages of Growth in Silurian Brachiopoda. 



XVIII. Stages of Growth in Silurian Brachiopoda. 



XIX. Stages of Growth in Silurian Brachiopoda. 



XX. Stages of Growth in Silurian Brachinj)oda. 



XXI. Stages of Growth in Silurian Brachiopoda. 



XXII. Stages of Growth in Silurian IJrachiopoda. 



XXIII. Development of BUohites. 



XXIV. Development of Terehratalia. 

 XXV. Development of Terehratalia. 



XXVI. Brachial Supports in Dielasmn and Zygospira. 



XXVII. Development of Pleurodictyum. 



XXVTII. Pleurodictijum. 



XXIX. Pleurodictijum. 



XXX. Pleurodictyum. 



XXXI. Pleurodictyum and Favosites. 



XXXII. Favositidae. 



XXXIII. Favositida;. 



XXXIV. Tornoceras. 



