334 TRANS. OF THE ACAD. OF SCIENCE. 



A Catalogue of the Palaeozoic Fossils of North 

 America. 



By B. F. Shtjmaed, M.D. 



No one can be more sensibly aware of the imperfections 

 of this Catalogue than the Author, although he has spared 

 no pains to make it as complete as possible. There can be 

 no doubt that the list of species will be very considerably 

 diminished and the classification materially modified when 

 the subject shall have been more thoroughly studied. The 

 difficulties in the way of producing, at this time, a com- 

 plete synonymic list of Palaeozoic Fossils must be acknowl- 

 edged by all who have devoted much attention to the study 

 of American Palaeontology. While it is true that a great 

 many of our fossils have been well described and figured, it 

 is equally true that the descriptions of others are exceed- 

 ingly meagre and unsatisfactory, and the type specimens 

 are often inaccessible to the student. Indeed in not a 

 few instances it is absolutely impossible to identify species 

 from the published descriptions and figures. It is earnestly 

 hoped that the mania for species-making is rapidly passing 

 away, and that Naturalists will deem it of quite as much 

 importance to the interests of science to rectify and prop- 

 erly classify what has already been done, as to add new 

 names to the list of species. In the Catalogue, the Author 

 has not hesitated to place among the synonyms of species 

 such names as he felt satisfied properly belong there ; but 

 in cases where there seemed to be a doubt he has, for the 

 present, allowed them to rank as species, rather than run 

 the risk of adding to the confusion by wrong references. 



LIST OF ABBREVIATIONS OF THE GEOLOGICAL FORMATIONS. 



Pots. — Potsdam Sandstone. 

 Cal. — Calciferous Sand Group = Quebec Group. 

 Cha. — Chazy Group. 

 / B. B. — Birdseye and Black Rirer Limestone. 

 Lower Silurian. ^ Tr.— Trenton Limestone. 

 Gal. — Galena Limestone. 

 U. S — Utica Slate. 

 H. R.- Hudson River Group. 

 M. S.— Middle Silurian. 

 / Cl. — Clinton Group. 

 V C G. — Cape Girardeau Limestone. 

 _,_.,. J Niao —Niagara Group. 



Upper Silurian. < o. S —Onondaga Salt Group. 

 / W. L. — Water-Lime Group. 

 V. 1>. H.— Lower Helderberg Group. 



SOrisk. — Oriskany Sandstone. 

 C. II.— Upper Helderberg Group. 

 Ham— Hamilton Group 

 Chem. — Chemung and Portage Groups. 

 ( Enc. — Encrinital Limestone = Burlington Limestone. 

 \ Arch. — Archimedes Limestone = Keokuk and Warsnw Limestone* 

 Carboniferous. / St. L— St. Louis Limestone, [of Prof. Hall. 



( Kas — Kaskaskia Limestone, or Upper Archimedes Limestone. 

 ( L. C. M. — Lower Coal Measures. 

 Coal Measures. J U. C M.— Upper Coal Measures. 



Per. — Permian. 



