CONTENTS. 



Martindale, Isaac C. Sexual Variations in Castanea Ameri- 



cara. (Continued.) 352 



Meehan, Thos. Sexual Variations in Plants, . . . 353 

 Meehan, Thos. Rain Trees. Note on Yucca gloriosa. . 355 

 Meehan, Thos. Dia3cism in Andromeda Catesbaii, Walt. . 356 

 Potts, Edw. On fresh-water Sponges. . ; . . 356 

 Meehan, Thos. Note on the Seed-A-essels of Wistaria. . 358 

 Allen, Harrison, M.D. The Phalanges of Bats. . . 359 

 McCooK, Rev. H. C. Note on a new Northern Cutting 



Ant, Atta septentrionalis 359 



Heilprin, Angelo. On some New Lower Eocene Mollusca 

 from Clarke Co., Alabama, with some points as to the 

 Stratigraphical Position of the Beds containing them. 



(Plate 20.) 364 



McCooK, Rev. H. C. The Shining Slavemaker.— Notes on 

 the Architecture and Habits of the American Slave- 

 making Ant, Polygergus lucidus. * (Plate 19.) . . 376 

 Allen, Harrison, M. D. On the Temporal and Masseter 



Muscles of Mammals . 385 



Report of the President. . 397 



Report of the Recording Secretary 406 



Report of the Corresponding Secretarj^ 407 



Report of the Librarian • . 408 



Report of the Curators. 410 



Report of the Biological and Microscopical Section. . . 413 

 Report of the Conchological Section. . . . .414 



Report of the Botanical Section 418 



Report of the Entomological Section 421 



Report of the Mineralogical and Geological Section. . . 422 



Summary of the Report of the Treasurer 425 



Election of Officers for 1881 428 



Index to Genera 451 



3. 



I 



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