CONTENTS. 



No. 1. 



I. Distribution of Kansas Crayfishes (with map) ,/. Arthur Harris 1 



II. Observations on Pollination of Solarium rostratum Dunal and Cassia 

 chamcecrista L. i with plate). .J. Arthur Harris and Oscar M. Kuchs 15 



No. 2. 



Spermatid Transformations in Gryllus assimilis with special reference to 

 the Nebenkern (with two plates) W. J. Baumgartner 47 



No. 3. 



Dolichopodida? of Grenada, W. I. (with plate) T. M. Aldrich 75 



No. 4. 

 Report of Sanitary Chemical Water Analysis Edward Bartow 99 



No. 5. 



Projective Transformations in one Dimension and their Continuous Groups, 



H. B. Netrson 115 

 No. (J. 



I. New Fossils from the Upper Carboniferous of Kansas (with plate) 



J. W. Beede 147 



II. Variation of the Spiralia in Seminula argentia (Shepard) Hall (with 

 plate ) J. W. Beede 155 



No. 7. 



Coal Measures Faunal Studies, II, ( Beede and Rogers.) Fauna of the Shaw- 

 nee Formation, (Haworth.) The Wabaunsee Formation, (Prosser.) 

 The Cottonwood Limestone ./. IF. Beede 163 



No. 8. 



The Spermatocyte Divisions of the Locustidre (with four plates) 



C. E. McChwg 185 

 No. 9. 



I. Restoration of Dolichorhynchops osborni, a new Cretaceous Plesiosaur 



( with plate ) S. W. WWiston 241 



II. Notes on Some New or Little-known Extinct Reptiles (with two plates), 



S. W. Williston 247 



III. On certain Homoplastic Characters in Aquatic Air-breathing Verte- 

 brates S. W. WWiston 259 



No. 10. 



Some New American Species of Cyclus from the Coal Measures (with plate), 



Austin F. Rogers 269 

 No. 11. 



On Collineations in Space which Leave Invariant a Quadric Surface 



Helen B. Brewster 281 



No. 12. 



On Monoids John N. Van der I V/es 305 



