3* 



E 



CONTENTS. 



Morris, Charles. The Primary Conditions of Fossilization. 



McCook, Rev. H. C. Hibernation and Winter Habits of Spiders, 



Scudder, S. H. Notes on Mesozoic Cockroaches, 



Meeiian. Tiios. Persistence in Variations Suddenly Introduced, 



Meehan, Thos. Influence of Temperature on the Separate Sexes 

 of Flowers, ....... 



Meehan, Thos. Elasticity in the Fruit of Cactaceae, 



Willcox, Jos. Spawning of Fulgur perversus, . 



Lewis, H. C. Erythrite, Genthite and Cuprite from near Phila 

 delphia, ........ 



Leidy, Jos., M. D. Bothriocephalic in a Trout . . 



Morris, Chas. On the Air-Bladder of Fishes, . 



Blatchley, Willis S. On the Genus Aphredoderus, 



Gentry, Alan F. A Review of the Genus Phrynosoma, . 



Hall, Edw, A. A Review of the American Genera and Species 

 of Mullidse, . . . . . . ■ . 



Lewis, II. C. Marginal Blames (Plate III). 



Streckeb, Herman. Descriptions of New Species of Lepidoptera 



Scott, \\ . B. Cervalces Americanus, a fossil Moose, or Elk 

 from the Quaternary of New Jersey (Plate II), . 



Hartman, Wm. !>., M. D. Descriptions of New Species of Par- 

 tula and a Synonymic Catalogue of the Genus, 



Poote, Dr. A. E. On large Crystals of Stibnite, 



97 

 102 

 105 

 116 



in 



117 



Hit 



120 



122 



124 

 13(i' 

 138 



149 

 157 

 174 



181 



203 



22 1 



, In 1 lit S« 



