CONTENTS OF VOL 111 



No. 1. March 31, 1904. 



I. George L. Streeter. The Structure of the Spinal Cord 



of the Ostrich 1 



With 6 text figures. 



II. William J. Moenkhaus. The Development of the 

 Hybrids between Fundulus Heteroclitus and Menidia 

 Notata with Especial Eeference to the Behavior of the 



Maternal and Paternal Chromatin 29 



With 4 plates. 



III. John Lewis Bremer. On the Lung of the Opossum . 67 

 With 11 text figures. 



lY. A. M. Spurgin. Enamel in the Teeth of an Embryo 



Edentate (Dasypus Novemcinctus Linn) 75 



With 3 plates. 



No. 2. June 15, 1904. 



V. Bennet Mills Allen. The Embryonic Development of 



the Ovary and Testis of the Mammals 89 



With 7 plates and 5 text figures. 



VI. Arthur W. Meyer. On the Structure of the Human 



Umbilical Vesicle 155 



With 5 text figures. 



VII. E. H. Whitehead. The Embryonic Development of the 



Interstitial Cells of Leydig 167 



With 10 text figures. 



VIII. Florence E. Sabin. On the Development of the Super- 

 ficial Lymphatics in the Skin of the Pig . . . . .183 

 With 7 text figures. 



