PLATE LI1. 



Figure- magnified 500 diameters, except the Miorasteriaa 375. 



P \ r. f . 



Staurastrum senabxi m. end view, .... 147 



Mn l: v-l EB1AB DH HOTOMA, . . . . . Ill 



MlCBASTERIAS V >i:i>Ti:i> U v.\i"M. .... 11.'-! 



end and lateral view . . 1 1 " 



M ICB \-i EBJ LB Ra BENHOBSTIT, . . . .118 



m mi: \-i in m I; w i.m i. ii, . . . 14:> 



Comariom M II I'l I.r.M. ..... 62 



Ii tSTRUM drnaforme, front and transverse view, . . 100 



111 lstrum V 'mi- 1 1 pi i \ m m. side, transverse, and end views, 105 

 X \s i in hum a n 1 1 1 ! i i m, \ 'ar. Minneapoliense, ''! 



Staurastrum quaternium, end and front views, . 144 



Staub \ - r i : i m 1 >os mi i. ii. ..... 132 



l'.i \si i:i m \i;i:i ri i m. variety, . . . .107 



Staurastrum purcigerum, front and end view, . , 146 



Staurastrum furcatum, (St. spinoeum), . . . 150 



Si m RASTRi m i-i.i d u [GERi m. front ami end view, . 147 



St u i: \-i i:i M BB \< ill \ I i M, . . . . 1-1 



&] VI l: kSTRUM I.I I. AT \ll M, . . . .128 



Staurastrum furcatum, (St. spinosum), . . . 150 



