SUBCLASS I 



TRILOBITA 



729 



Table showing Vertical Range of Trilobites 



Orders and Families. 



? C i -O t: 





Order 1. Hypoparia 



Family 1. Agnostidae . 



2. Eodiscidae . 



3. Shumardiidae 



4. Harpedidae 



5. Trinucleidae 



6. Raphiophcrridae 



Order 2. Opisthoparia 



Family 1. Conocoryphidae 



2. Mesonacidae 



3. Paradoxidae 



4. Olenidae 



5. Solenopleuridae 



6. Oryctocephalidae 



7. Ceratopygidae 



8. Ellipsocephalidae 



9. Remopleuridae 



10. Bathyuridae 



11. Asapliidae . 



12. lUaenidae . 



13. Dikelocephalidae 



14. Goldiidae . 



15. Proetidae . 



16. Aeglinidae . 



17. Lichadidae . 



18. Odontopleuridae 



Order 3. Proparia 



Family 1. Encrinuridae 



2. Calymenidae 



3. Cheiruridae 



4. Phacopidae . 



Total Number of Famili 



8 il 22 11 



3 ' 1 



[The foregoing cliapter oii Trilobites has been revised by Dr. Percy E. Raymond, of the 

 Museum of Comj)arativc Zoology at Cambridge, Mass. Some notes on Cambrian genera, 

 togetlier witli two or three figures illustrating the same, have been contributed by Dr. C. D. 

 Walcott. —Editor. ] 



