ADDENDA. 1H1 



M. quadratAj Bailey. (Add to page 117). 



Found good specimens in collections made in lakes, \\ inter 

 Park, Florida. Beside the typical form also a variety which 

 has the ends of the basal lobes deeply bisected, to nearly half 

 the length. 



St. Xoy.i: < '.f.s \i:i:.k. Wblle. (Add to page 1 15). 



This species, hitherto found only in a pond near Hammon- 

 ton, N. J., proves to have a home in Florida also. The plant 

 differs somewhal from the more Dorthern form, in having the 

 subulate spines at the angles not so long, and the cell itself not 

 quite so large. 



ERRATA. 



Paere 22 11th line from below read //. dimnlirns instead of 

 disiUiens. 



Page 47, 8th line from the top read ( '. setacewm instead cetaceuto. 

 Page 4s, 14th line from the top read XII instead of XI. 

 Page 94, 1st line read anti instead of ante. 

 Page 128, 8th line from the top read 1 I instead of 13. 



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