14 TWENTIETH ANNUAL REPORT OF THE REGENTS. 



3. On the Genus Strophodonta. 



4. On the Genus Chonetes, with a list of the species known in 



the New-York formations. 



5. On the Genera Productus, Strophalosia, Aulosteges 



and Productella. 



6. On the Genera Spirifera, Cyrtina and allied genera. 



7. On the Genera Athyris, Merista and Meristella. 



8. Note upon the Genus Zygospira, and its relations to Atrypa. 



9. Remarks upon the Genera Rhynchonella and Leiorhyn- 



CHUS. 



10. On the Genera Pentamerus and Stricklandinia, and their 



supposed relations with Renssel^ria. 



11. On the Genus Etchwaldia. 



12. On the Genera Terebratula, Centronella, Crypto- 



nella, etc. 



13. On the Genus Tropidoleptus. 



14. Note on the Genus Pal^aster, with descriptions of some 



new species, and observations upon those previously 

 described. 



15. Descriptions of some new species of Crinoidea and other 



Fossils from the Lower Silurian strata, principally of the 

 age of the Hudson-river group. 



16. Descriptions of Bryozoa and Corals from the Lower 



Helderberg group of New-York. 



17. Descriptions of Bryozoa, etc., from the Upper Helderberg 



and Hamilton groups of New-York. 



18. Miscellaneous Notices. 



19. Account of some new or little known species of Fossils, from 



rocks of the age of the Niagara group, with Observations on 

 the geographical distribution of the species of that epoch, etc. 



20. Notes upon the Geology of some parts of Minnesota. 



21. Note upon the structure of the mountain region in the north- 



ern part of Georgia and Alabama, and the adjacent parts of 

 Tennessee. 



22. Note upon the Geological relations of the oil-bearing strata 



of Canada West. 



23. Index to geological and palaeontological subjects in the 



Reports on the State Cabinet. 



