PLATE XLI. 



Figures magnified 500 diameters. 



Fig. 1. 

 " 2. 



Figs. 3, 4. 



" 5,6. 

 Fig. 7. 

 Figs. 8, 9. 



" in, 11. 



" 12, 13. 

 Fig. 14. 

 Figs. 1". 16. 



- 17, is. 

 " 19 25. 



- 26 28. 

 .. 29) 30 



:;i 35. 

 36 38. 

 39, 10. 



- 41. 12. 

 43 15. 



face. 

 Staurastrum quadrangtilare, a Minnesota variety, . . 145 



" " a Pennsylvania and N. Jersey 



variety, 



end view iif Florida forms. 



St \i i: wi 111 m i kin \ i im, 

 STAURASTRUM LONGISPINUM, 



Staurastrum spinosum, Set St. furcaitan, 



M \l l; Wl im U ri l.i ll Kl'M, 



Statjb wikim i n- i-i m, . 



six rayed form, 



STAUR \-i im m M-TIA II M, 

 Si u RASTR1 M Ki "1-1 \\i M. . 

 Si \ r i : \ - i i : i \i ENORM i :. . 



Staurastrum \i.i i i:n ^-, . 



ST mi; IlSTRI M -' U3RUM, 



>i \i B \-i i:i M M \l:i. \KI I \ilTM, 



Staurastrum rRicoRNE, 



St \i i; \-i im m pan* ctlosi m, 



St \ik \~i imm i:i i.i LOSUM, 

 v l \l RASTRl M PUN! TUX \ H M, 



145 

 145 

 126 

 146 



loll 



# 



132 

 132 

 149 

 1 19 

 128 

 128 

 130 



1 25 



1 26 

 124 

 127 

 127 



Compare note under St. taciturn, p. 132. This species Prom ponds, New Jersey, wae 

 described in the "Bull. Tor. B'>t. Club, N> Fork, 1880." Membrane smooth; end view 

 five-rayed; apices of raya obtusely rounded, bases wide, separated by a rounded sinus, 



