COISTTENTS. 



DoiXEY, Dr. Chas. S. On the histology of Salpa (Plate XIII) 



Leidy, Jos., M. D. Fossil bones from Florida . . . . " . 



KoENiG, George A., Ph. D. Preliminary note on a new mineral species from 



Franklin, N. J 



Leidy, Jos., M. D. Remarks on Hydra. ........ 



Heilpkin, Angelo. The classification of the Post-Cretaceous deposits. 



Meehan, Thomas. Contributions to the life-histories of plants 



Chapman, Henry C.,M.D. Notes on the anatomy of Hy.strix. (PlatesXIVand XV). 

 McCooK, Rev. Henry C, D. D. Notes on the sense of direction in a European 



ant, Formica rufa. . 

 WooLMAN, Lewis. Geological results of the boring of an artesian well at Atlantic 



City, N. J. 



McCooK, Rev. Henry C, D. D. Note on Cyrtophora bifurca and her cocoons, a 



new orb-weaving spider. .......... 



Ryder, John A. On the homologies and early history of the limbs of vertebrates. 

 McCooK, Rev. Henry C, D. D. Prolonged life of invertebrates: Notes on the 



age and habits of the American Tarantula. ....... 



Jordan, David Starr. Description of two new species of fishes from South 



America. . . ..... 



Jordan, David Starr. Note on Achirus Lorentzi. 



Meehan, Thomas. The origin of the grassy prairies. 



Leidy, Jos., M. D. Bot larvje in the Terrapin. 



Hkilprin, Angelo. Determination of the age of rock deposits. 



Heilprin, Angelo. The Miocene Mollusca of the State of New Jersey, 



Report of the Recording Secretary. 



Report of the Corresponding Secretary. . 



Report of the Librarian. ..... 



Report of the Curators. ...... 



Report of the Curator of the William S. Vaux Collections. 



Report of the Biological and Microscopical Section. 



Report of the Conchological Section. 



Report of the Entomological Section. 



Report of the Hcjtanical Section. .... 



Report of the Mineralogical and Geological Section. 

 Report of the Professor of Invertebrate Paleontology. 

 Report of the Professfll- of Mineralogy. . 

 Report of tlie Professor of Invertebrate Zoology. 

 Report of the Professor of Ethnology and Archreology. 

 Summary of the Report of the Treasurer. 

 Officers, Councillors and Finance Committee for 1888. 

 Members and Correspondents elected during 1887. 

 Additions to the Musenm. ..... 



Additions to the Lil)rary. ..... 



Index to Genera. ....... 



General Index. ...... 



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