CORRECTIONS OF THE PLATES. 



Plate IV., for Zonotricha read Zonotrichia. 



Plate VIII., for um in thelermlnations of the specific name of figures 2, 3, 



and 4, read us. 

 Plate IX., fig. 3, for argiUacea read argillaceus. * 



Plate X., fig. 4, for Botryococcus pulchellus read Dicti/ospJicefium piUcheUum- 

 Plate XI., fig. 5, 6, and 7, for Cosmarium read Closierium. 

 Plate XII., fig. 1 and 20, for Cosmarium read Closterium, 

 Plate XV., fig. 8, for insignis read insigne. 

 Plate XVI., fig. 4, for Bulhotricha read Bulbotriehia. 

 Plate XVIII., fig. 1, for Pringsheimii read Pringsheimia, 

 Plate XXI., fig. 7, for tctraopthalmum read telropihalmum. 



