iv Contents 



Page 

 Osterud, H. L. (with J. F. Bovard). Partial list of the animals 

 jielding embryological material at the Puget Sound Biological 

 Station 127 



Pease, Vinnie A. Taxonomy and morphology of the ligulate species 



of the genus Desmarestia 313 



Powers, Edwin B. The variation of the condition of sea-water, 

 especially the hydrogen-ion concentration, and its relation 

 to marine organisms 369 



Rigg, George B. Early stages in bog succession 195 



Shelford, V. E. The relation of marine fishes to acids with par- 

 ticular reference to the Miles Acid Process of sewage treatment 97 



Smith, Catharine W. Variation in the number of ribs in Costaria 



costata 307 



Zeller, Sanford M. An interesting fungus from Friday Harbor, 



Washington 95 



Zeller, Sanford M. Fungi found on Codium mucronatum 121 



