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 Triarlhrus. 



VIII. Appendages of Triarlhrus. 



IX. Triarlhrus. 



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. 



XVm. 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 Bilohiles. 



XXIV. Development of Terehralalia. 

 XXV. Development of Terebratalia. 



XXVI. Brachial Supports in Dielasma and Zygospira. 



XXVII. Development of Pleurodictyum. 



XX\'III. Pleurodictyum. 



XXIX. Pleurodictyum. 



XXX. Pleurodictyum. 



XXXI. Pleurodictyum and Favosites. 



XXXII. Favositidae. 



XXXIII. Favositida;. 



XXXIV. Tornoeeras. 



