CONTENTS. 



Keyes, Charles R. Sphrerodoma: a genus of fossil Gasteropods (Continued). 

 Meyer, Abraham. Notes on the presence of Umbral or Mountain Limestone in 



Lycoming Co., Penna. ............ 



Horn, H. Geo., M. D. The Antennre of Coleoptera 



Allen, Harrison, M. D. On the taxonomic value of the Wing Membranes and of 



the Terminal Phalanges of the Digits in the Cheiroptera. (Plate X). 

 Marx, Geo., M. D. On a new species of Spider of the genus Dinopis from the 



Southern United States. (Plate XI). 



Redfield, John H. Note on Pinus Banksiana 



Ives, J. E. Mimicry of the Environment in Pter'ophryne histrio. .... 



Ford, John. Notes on Crepidula ' . 



Sharp, Benjamin, M. D. Activity in Donax. 



Sharp, Benjamin, M. D. Change of Habit causing Change of Structure. 

 Gardiner, John, and L. J. K. Brace. Provisional List of the Plants of the Bahama 



Islands. ........ 



Rand, Theo. D. Notes on the drift on Block Island. 

 Pilsbry, H.*A. New and Little-known American Mollusks, No. 2. 

 Brinton, Daniel G., M. D. On a Petroglyph from the Island of St 

 Brown, Arthur Erwin. Description of a new species of Eutaenia 

 Report of the Recording Secretary. .... 



Report of the Corresponding Secretary. 



Report of the Librarian. ...... 



Report of the Curators. ...... 



Report of Biological and Microscopical Section. 



Report of the Conchological Section. 



Report of the Entomological Section. 



Report of the Botanical Section. . . 



Report of the Mineralogical and Geological Section. 



Report of the Professor of Invertebrate Paleontology. 



Report of the Professor of Ethnology and Archeology 



Report of the Professor of Invertebrate Zoology 



Report of the Treasurer. . 



Officers to serve during 1890. 



PAGE. 

 305 



310 

 311 



313 



341 

 344 



344 

 :!45 



Elections of Members and Correspondents 

 Additions to the Museum. . , 



Additions to the Library. 

 Index to Genera. .... 

 General Index. .... 



(Plate XII). . 

 Vincent, W. I. 



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