Contributions to tlie life-histories of plants, No. III. Smilacina bifolia. 



Dichogamy and its significance. Trientalis Americana. On the 



glands in some Caryophyllaceous flowers 391 



McCook, Rev. Henry C, D. D. Descriptive notes on new American species 



of Orb- weaving spiders 193 



A new fossil spider, Eoatypus Woodwardii 200 



Nesting habits of the new American Purse web Spider 203 



Ochsenius, Carl. On tiie formation of rock-salt beds and mother liquor salts. 181 

 Osborn, Hemy Fairfield. Additional observations upon the structure and 



classification of the Mesozoic Mammalia 292 



Pilsbry, Henry A. On the Helicoid land Mollusks of Bermuda, (Plate 



XVII.) 28.> 



Kingueberg, Eugene N. S., M. D. Some new species of fossils from the 



Niagara Shales of Western New York. (Plates VII.) 131 



Ruschenberger, W. S. W., M. D. Biographical notice of Geo. W. Tryon Jr. 



(With portrait.) 399' 



Wachsmuth, Charles and Frank Springer. Discovery of the ventral structure 



of Taxocrinus an.d Haplocrinus and consequent modification in the 



classification of the Crinoidea. (Plate XVIII.) 337 



Crotalocrinus : its structure and zoological position. (Plates XIX, XX.) 364 

 Wright, Berlin Hart. Description of new species of Uniones from Florida. 



(Plates II, HI, IV, V, VI.) 113 



