LIST OF THU PLATES. 



PLATE CXXVIII. 



Figs. 1-0,9. Staurastrum punciu- 



latum (p. 179) 

 7-8.St.pilo8ellwn (p. 187) 



,, 10-14. St. gramilosvm (p. 

 188) 



PLATE CXXVIII continued. 



Figs. 15. St. paxilliferum (p. 



190) 



16. Artliroclesmus trian- 



gvlaris (p. 97) 



