CORRECTION. 

 Pag^l, for Cyclonema ventricosa read Cjclonema varicosa. 

 Pa|PB2, for large, read larger. 



CORRECTION FOR THE THIRTEENTH ANNUAL 



REPORT. 



Page 113. In the title of the article for " Hudson-river group," 

 read Quebec group. 



This correction was made in a part of the edition. 



The NOTICE on page 128 did not reach the printer till the form 

 was on the press, and consequently some of the first copies 

 printed are without this notice. 



