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Mr. F. W. Putnam. Palaeolothic Implements from Wakefield, Mass 122 
General Meeting , Jan. 19, 1881 124 
Dr. C. C. Abbott. Historical Sketch of the discoveries of Palaeolithic Implements 
in the Delaware Valley 124 
Professor Henry W. Haynes. The Argillite Implements of the Delaware Grav- 
els compared with the Palaeolithic Implements of Europe 132 
Professor G. Fred. Wright. An attempt to estimate the Age of the Palaeolithic- 
bearing Gravels in Trenton, N. J 137 
Messrs. Carr, Wadsworth and Putnam. Remarks on the preceding subjects. . 141 
Section of Entomology, Jan. 26, 1881 149 
Dr. H. A. Hagen. List of papers by Dr. T. W. Harris not mentioned in the 
“ Harris Correspondence ” 150 
General Meeting, Feb. 2, 1881 152 
General Meeting, Feb. 16, 1881 153 
Mr. Edward Burgess. Note on the Aorta of Lepidopterous Insects 153 
General Meeting , March 2, 1881 156 
Principal J. W. Dawson. Note on Spirorbis contained in an Ironstone Nodule 
from Mazon Creek 157 
General Meeting, March 16, 1881 158 
Death of George B. Emerson 158 
Election of Members 160 
Amendments of the Constitution and By-laws 160 
Professor N. S. Shaler. On the Recent Advances and Recession of Glaciers. . . . 162 
Section of Entomology, March 23, 1881 167 
Mr. S. PI. Scudder. On Lithosialis bohemica . . „ 167 
General Meeting , April 6, 1881 168 
General Meeting, April 20, 1881 168 
Mr. J. S. Diller. On the Felsites of the vicinity of Boston 168 
Mr. J. S. Kingsley. A case of Polymely in the Batrachia (with Plate 2) 169 
Annual Meeting , May 4, 1831 175 
Professor A. Hyatt. Custodian’s Report 175 
Mr. Edward Burgess. Secretary’s Re; ort 186 
Mr. Chas. W. Scudder. Treasurer’s Report 192 
Election of Officers for 1881-82 193 
Election of Members 194 
General Meeting , Mav 18, 1881 194 
Dr. M. E. Wadsworth. A Microscopic Study of the Cumberland Iron Ore of 
Rhode Island . . . . 194 
Mr. W. W. Dodge. Notes on the Geology of Eastern Massachusetts 197 
Mr. F. W. Putnam. Recent Archaeological Exploration at Madisonville, Ohio. .. 216 
General Meeting , October 5, 1881 222 
Mr. Edward Burgess. Structure of the Mouth in the Larva of Dvtiscus 223 
Mr. Fred. A. Lucas The Species of Orangs 228 
General Meeting , Oct. 19, 1881 233 
Mr. N. F. Merrill. Concerning the Lithological Collection of the Exploration of 
the Fortieth Parallel 234 
Dr. M. E. Wadsworth. Some points relating to the Geological Exploration of 
the Fortieth Parallel 243 
Dr. M. E. Wadsworth. The Relation of the Quincy Granite to the Primordial 
Argillite of Braintree, Mass 274 
