Meyer, Abraham. Notes on the occurrence of quartz and other 

 minerals in the Chemung Measures, near the line of Ly- 

 coming and Tioga Counties, Pennsylvania 194 



Pyrophyllite slate in Northern Pennsylvania 197 



Moore, J. Percy. On some Leech-like parasites of American 



Crayfishes (Plate XII) 419 



Rex, George A., M. D. New North American Myxomycetes . . 364 



Rhoads, Samuel R. The birds observed in British Columbia and 



Washington during the spring and summer, 1892 21 



Description of new species of North American Mammals with 

 remarks on species of the genus Perognathus 404 



Ryder, John A. The inheritance of modifications due to distur- 

 bances of the early stage of development, especially in the 



Japanese domesticated races of Gold-Carp 75 



The vascular respiratory mechanism of the vertical fins of the 

 viviparous Embiotocida? 95 



Sharp, Benjamin, M. D. Catalogue of the Crustaceans in the 

 Museum of the Academy of Natural Sciences of Philadel- 

 phia 104 



Sterki, V. Observations on Vallonia (Plate VIII) 234 



Growth changes in the radula in Land Mollusks (Plates X, 

 XI) 388 



Stone, Witmer. Description of a new species of Neotoma from 



Pennsylvania 16 



Strecker, Herman. Descriptions of two new species of North 



American Bombycida? 282 



Tarr, RalphS. Notes on the physical geography of Texas . . . 313 



