SYNOPTICAL VIEW. 
Principal Authorities consulted. F. J. Pictet : Traite de Paleont- 
ologie, 4 vols., 8vo,, with a 4to Atlas of 110 Plates. J. D. Dana : Man¬ 
ual of Geology. A. D’Orbigny : Gouts elementaire de Paleontologie et de 
Geologie stratigraphiques, 2 vols. in three parts, large 18mo, and a 4to At¬ 
las of Tables. J. Hall : Paleontology of New York, 4 vols., 4to, with 
many Plates ; Annual Reports of the Regents of the University of the State 
of New York on the condition of the State Cabinet , Nos, X to XVIII ; etc. 
Thos. Davidson : A monograph of the Fossil Brachiopoda of Great Brit¬ 
ain, Parts I to VII. F. B. Meek : Palaeontologg of the Upper Missouri. 
Invertebrates, Part I. 4to, 185 pp.; Palaeontology of Rlinois, Vol. I; etc. 
E. Billings: Palaeozoic Fossils of Canada, Vol. I. roy., 8vo, 426 pp., 
wood cuts. Devonian fossils of Canada West, in Canadian Jonrnal, 
March and May, 1860, and March, May, and July, 1861; Catalogue of Si¬ 
lurian Fossils of Anticosti, 93 pp.; etc. B. F. Shumard : Palaeontology 
of Missouri and Texas, in Missouri Geological Report, Trans. Acad. Sci., 
St. Louis, Am. Jour. Sci.; Catalogue of Palaeozoic Fossils of N. A., I, 
Echinodermata. D. D. Owen: Geological Survey of Wis. and Min. ; 
etc- R. I. Murchison : Silurian System ; Siluria ; Introduction to Da¬ 
vidson’s Silurian Brachiopoda of Great Britain. J. S. Newberry: 
Palaeontology of Illinois, Vol. I; Colorado Exploring Expedition; the 
Scientific Journals. L. Lesquereux : Geology ^and Palaeontology of 111., 
Vols. I and II; Geology of Ky., Vols. Ill and IV; Geology of Penn. 
Also, the works of T. A. Conrad, J. Leidy, C A. White, T. M. Saf- 
ford, L. Agassiz, M. Tuomy, F. V. Hayden, G. C, Swallow, R. P. 
Whitfield, J. W. Dawson, E. Emmons, F. S. Holmes. 
Note.— Names of generic and specific value are printed in italics; of families, in Roman 
letters, and of higher groups in small capitals. An asterisk affixed to the name of a spe¬ 
cies or genus indicates that it has survived to the present day. 
I. PALAEOZOIC TIME. 
First appearance of Organic Life. 
Reign of the ancient forms of life, all the species and almost 
all the genera of which have become extinct. 
1. LAUREXTIAX AGE (Lower Azoic). 
f First appearance of vegetal and animal life. 
I Reign of Protozoans and Fucoids. 
v Period of Eozoon canadense (Foraminifer) the sole organism pos- 
! itively known. 
V 
