iv CONTENTS 



No. 3. SEPTEMBER 



Julia E. Moody. Observutions on tho life-history of two rare ciliatcs, 



Spathidiuni spafliula and Actiiioljolus radians. Sixty-six figun>s 349 



C. H. Danforth. Tlic heart and arteries of Polyodon, Nineteen figures 409 



Bertram G. Smith. The embryology of Cryptobranchus allegheniensis, 

 including comparisons with some other vertebrates. II. General embry- 

 onic and hirval development . with special reference to external features. 

 Two hundred and twenty-three figures 455 



No. 4. DECEMBER 



lionERT Mathioson. The structure and nu^taniorphosis of the fdi'c-gut of 



Corydalis cornutus L. Twenty-nine figures 581 



W. M. Smallwood and Elizabeth G. Clark. Chromodoris zebra Heilfnin, 



a distinct s])ecies. Six figures 625 



S. W. AVillistgn. Primitive reptiles. One figure 637 



Gary X. Calkins. The pacdogamous conjugation of Blejjharisma undulans 



St. Twenty-five figures 667 



B. ^\'. KUNKEL. The devclo])niciit of the skull of Fniys lutaria. Thirty-one 



figures 693 



