32 DONS. — 21 DÉCEMBRIC 1880-21 FÉVRIER 1881. 
États-Unis. Boston. American Academy of arts and Sciences. 
Proceedinj^s of the — t. XÏV, 1879 et t. XV, n° 1, 1880. 
— Boston Society of Natural History, t. III, partie I, n° 2 et 3, 1879. 
S. H. Scudder. The early types of insects, or the origin and séquence ofinsect 
life in palœozoic times, 13. — Palœozoic Cockroaches ; a complète revision of the 
species of both \vûrlds, with an essay towards their classification, 23. 
Cambridge. Muséum of comparative Zoology at Harvard Collège. 
Memoirs of the —, t. VI, n° 1, 1879-80. 
J.-D, T\'hitiiey- — The auriferous gravels of the Sierra Nevada of California. 
Id., t." VI, n° 2, part. I, 1878. 
L. Lesquereux. — Report on the fossil plants of the auriferous gravel deposits 
of the Sierra Nevada. 
— — Id., t. VII, n° 2, part. I, 1880. 
J.-D. Whitney. — The climatic changes of later geological times. 
Indianapolis. Geological survey of Indiana. Eigîith, ninth and tenth 
annual reports of the — , 1879. 
Newhaven. The american journal of Science, t. XXI, n°^ 121 et 
122, janvier-février 1881. 
G. Hawes. — The Albany Granité, New Hampshire, and its contact phe- 
nomena, 21. 
Ch. Barrois. — Rewiew of Professor Hall's recently published volume on the 
Devoniaii fossils of New-York, 44. 
S. H. Scudder. — Relation of Devonian Insects to later and existing types, ill. 
G. F. Wright. — Date of the Glacial era in eastern North America, 120. 
R. P. Whitfielf. — A new Genus and species of Air-Breatbing Mollusk from 
the coal-measures of Ohio, 125. 
H. M. Change. — The millstone grit in England and Pennsylvania, 134, 
0. C. Marsh. — Principal characters of American Jurassic Dinosaurs, 167. 
Philadelphia. American Philosophical Society. Proceedings of the 
— , t. XVIII, no 104, juillet à décembre 1879. 
P. Frazer. — Possil forms in the Quartoze Rocks of the Lovver Susquehanna, 277. 
J. J. Stevenson. — Surface Geology of South-west Pennsylvania and adjacent 
portions of Y\"est Virginia and Maryland, 289. 
Grande-Bretagne. Londres. The geological magazine. New 
Séries, Décade II, t. VIII, n°^ 1 et 2, janvier-février 1881. 
Th. Davidson. — On spiral-bearing Brachiopoda from the Wenlock and Ludlow 
shales of Shropshire, l. 
H. G. Seeley. — On two Ornithosaurians from the upper greensaud of Cam- 
bridge, 13. 
0. Fisher, — Oblique and Orthogonal sections of a folded plane, 20. 
F. D. Longe. — On the Oolitic P.olyzoa, 23. 
R. H. Traquair. On new Fish-remains from the blackband Iroustone of Bo- 
roughlee, near Edimburg, 3i. 
