MACKIE — ON FOSSIL BIEDS. 
17 
Kemarks on the Fossil Impressions in the Sandstone Eooks of Connecticut 
Eiver. By Professor John C. AYarren, M.D. 1 vol. of 54 passes and 1 
plate. 1854. 
On the Footprints occurring in the Pottsdam Sandstone of Canada. By 
W. E. Logan, Esq. In ' Quarterly Journal of Geological Society,' 
1852. p, 199. 
Description of the Impressions of Footprints of the Prototichnites, from 
the Pottsdam Sandstone of Canada. By Professor 11. Owen, F.E.S. 
In * Quarterly Journal of Geological Society,' 1852, p. 214, with 10 
plates. 
On recent Bird-tracks on the Sand of the Bay of Fundy. By J. L. 
Hayes. In ' Annual of Scientific Discover}' ' for 1851, p. '314. 
On the Eeptilian Footprints in the Carboniferous Eocks of Eastern 
America ; Impressions (chiefly Tracks) on Alluvial CJay in Hadley, 
Massachusetts. By Charles 11. Hitchcock. In ' American Journal of 
Science,' May, 1855. 5 pages. 
Fossil Footmarks on the Eed Sandstone of Poltsville, Pennsylvania. B}-- 
Isaac Lea. 16 pages super-royal folio, with 1 double lithographic plate. 
1855. 
On a Few Fossil Footprints {Giffcind/jms caudatiis). By Edward Hitch- 
cock. In ' American Journal of Science,' new series, vol. xxi. p. 96. 
3 pages and a sketch. January, 1856. 
On 5»'ew and Eemarkable Gigantic Fossils and Footmarks. By John C. 
Warren, M.D. Eead before the Boston Society of oXatural History, 
January, 1856. In ' Boston Daily Traveller,' January 2kh, 1856. 
Additional Facts respecting the Tracts of Otozoum Moodii on the Liassic 
Sandstone of the Connecticut A'alley. By Edward Hitchcock. In 
Proceedings of American Scientific Association, 1856, p. 228. 
On the Sandstone Fossils of Connecticut Eiver. By James Deane, M.D. 
6 quarto pages, with 3 plates. In 'Journal of the Academy of Natural 
Science,' second series, vol. iii. March, 1856. 
Connection of Fossil Footprints w ith the Theory of Progressive Develop- 
ment. By Professor H. D. Eogers. In ' Annual of Scientific Dis- 
covery,' 1856, p. 314. 
Fossil Footprints. By Professor J. AYyman. Discovered by Professor 
H. D. Eogers, in Carboniferous strata, Pennsylvania. In Proceedings 
of Boston Society of Natural History, vol. v. p. 258. 'American 
Journal of Science,' vol. xxi. new series, p. 441. May, 1856. 
Notice of Chelichnus Wymanianus. By Isaac Lea. In 'American Journal 
of Science,' vol. xxii. new series, p. 123. July, 1856. 
Ichnology of New England. A Eeport on the Sandstone of the Connec- 
ticut Valley, especially its Fossil Footmarks, made to the Government 
of Massachusetts. By Edv. ard Hitchcock. 1 vol. quarto, of 232 pages, 
vrith 60 plates, illustrating one hundred and nineteen species of the Con- 
necticut Valley, 1858. 
It would interfere with our plan, however, to enter here into de- 
tails of these footprints, and we shall therefore pass on to the first 
notice of the actual remains of birds in this formation, reserving 
hereafter a chapter especially devoted to Ornithictites, and the evi- 
dence they a^^brd of the classes of birds or animals tliat made them. 
This occurs in Mr. E. Emmons's ' American Geology,' part vi., pub- 
lished at Albany, N. T., in 1857, where at page 148 is the following 
description : — 
^ VOL. VII. D 
