0O]S[TENTS. 



Scott, W. B. A Revision of the North American Creodonta. (Continued.) . . 321 



Rand, Theodore D. Geology of the Isles of Shoals 324 



Cope, Edward D. On the Permanent and Temporary Dentition of Certain Three- 

 toed Horses. ............. 325 



Cope, Edward D. A Hyrena and other Carnivora from Texas. .... 326 



Sharp, Benjamin, M. D. On Hippa emerita. 327 



PiLSisRY, Henry A. A New Marine Gasteropod from New Jersey. (Plate XIV, 



Figs. 1,2, 3.) 328 



Rex, Geo. A., M. D. Diachcea Thomasii, a new Species of Myxomycetes. . . 329 

 Cope, Edward D. The Batrachia and Reptilia of North Western Texas. . . 331 



PiLSBRY, Henry A. Notes on a Collection of Shells from the State of Tabasco, 



Mexico. (Plate XIV.) .338 



Peary, Robert E. Report of the Operations of the North Greenland Expedition of 



1891-1892 342 



Chapman, Henry C, M. D. Note on the Geology of Mt. Desert Island. . . 350 



Ryder, John A. Diffuse Pigmentation of the Epidermis of the Oyster due to pro- 

 longed exposure to the light: Regeneration of the Shell and loss of Adductor 



Muscle 350 



Ryder, John A. The Hermaphroditism and Viviparity of the Oyster of the North- 

 west Coast of the United States. ......... 351 



Ryder, John A. On the Cause of the Greening of the Oyster and lis presumed 



Algous Endoparasite?. 352 



FoOTE, E. A., M. D. a Meteoric Stone seen to fall at Bath, South Dakota. . . 353 

 Report of the Committee on the Hayden Memorial Geological Award. . 3.H 



Greene, Edw. L. Eclogse Botanicre, No. 1 • 357 



Meehan, Thomas. Contributions to the Life-Histories of Plants, No. 8: Euphrasia 

 officinalis; Notes on Gaura and CEnothera; The Carpellary Structure of 

 Nymphrea; On the Sexual Characters of Rhus; Rubus cham?emorus; Dali- 

 barda repens 371 ; On some Morphological Distinctions in the Genera of 

 EricaceK; Vitality of Seeds, Eysimachia atropurpurea ; Campanula rotund- 

 ifolia; Cornus canadensis; Aralia hispicia; Luzula campestris; Cakile ameri- 

 cana; Hypericum ellipticum; Trifolium hybridum; Lathy rus maritimus; 

 Lonicera ccerulea; Raphanus sativus ; On the Nature of the Verruca in some 



Convolvulaceae; Polygonum cilinode; Aster tatarica 366 



Pilsbry, Henry A. Preliminary Outline of a New Classification of the Helices. . 387 

 Scott, W. B. The Evolution of the Premolar Teeth in the Mammals. . . . 405 

 Rand, Theodore D. The Supposed South Chester Valley Hill Fault. . . .445 



Meehan, Thomas. Notes on Monarda fistulosa 449 



Keller, Ida A., Ph. D. The Phenomenon of Fertilization in the Flowers of Monarda 



fistulosa. (Plate XV.) 452 



Ryder, John A. The Principle of the Conservation of Energy in Biological Evolu- 

 tion : a Reclamation and Critique. .....•••■ 4oO 



Wright, G. Frederick. Extra Morainic Drift in the Susquehanna, Lehigh and 



Delaware Valleys. .....••••■• 4o9 



Report of the Recording Secretary. ..-....■•• 48o 



Report of the Corresponding Secretary 48o 



Report of the Librarian. .....••••■■ ^oH 



Report of the Curators 4J1 



Report of the Biological and Microscopical Section. 4J4 



Report of the Conservator of the Conchological Section 495 



Report of the Entomological Section. 49/ 



Report of the Botanical Section. 4Jo 



Report of the Mineralogical and Geological Section 500 



Report of the Ornithological Section. ^J^O 



Report of the Professor of Invertebrate Paleontology -jO- 



Report of the Professor of the Lower Invertebrata 503 



Report of the Curator of the William S. Vaux Collections 504 



Report of the Jc^sup Fund ^^^ 



Officers, Councillors and Members of the Finance Committee for 1893. • • • 5U8 



Elections during 1892 ^^}f 



Additions to the Museum. '^j^ 



Index to Genera. .....•.•••••• '^'^ 



General Index ^~^ 



