Table of Contents. 



vn 



PLATES. 



Five Species of Fungi. 

 Bones of Extinct Porto Rican Birds. 

 Bones of Extinct Porto Rican Birds. 

 Cockleburs (Xanthium). 



The Committee on Publications declares that each paper of this volume 

 was distributed on the date indicated on its initial page. The Index, 

 title page, and minutes of meetings for 1920 (pp. i-xiv; 187-194) were 

 issued on March 15, 1921. 



