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 Terebratellidae. 

 XV. Stages of Growth in Silurian Brachiopoda. 



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 Brachiopoda. 



XXI. Stages of Growth in Silurian Brachiopoda. 



XXII. Stages of Growth in Silurian Brachiopoda. 



XXIII. Development of BiloUtes. 



XXIV. Development of Terebratalia. 

 XXV. Development of Terebratalia. 



XXVI. Brachial Supports in Dielasma and Zygosplra. 



XXVII. Development of Pleurodictyum. 



XXVIII. Pleurodictyum. 



XXIX. Pleurodictyum. 



XXX. Pleurodictyum. 



XXXI. Pleurodictyum and Favosites. 



XXXII. Favositidaj. 



XXXIII. Favositidse. 



XXXIV. Tornoceras. 



