II 



STRUCTURE AND DEVELOPMENT 

 OF TRILOBITES 



1. OUTLINE OF A NATURAL CLASSIFICATION OF THE 



TRILOBITES 



2. THE SYSTEMATIC POSITION OF THE TRILOBITES 



3. THE LARVAL STAGES OF TRILOBITES 



4. ON THE MODE OF OCCURRENCE AND THE STRUC- 



TURE AND DEVELOPMENT OF TRIARTHRUS BECKI 



5. FURTHER OBSERVATIONS ON THE VENTRAL STRUC- 



TURE OF TRIARTHRUS 



6. THE MORPHOLOGY OF TRIARTHRUS 



7. STRUCTURE AND APPENDAGES OF TRINUCLEUS 



