PLATE LI. 



Figure- magnified 500 diameters. 



P.vr.F.. 



Figs. 1, 2. Staurastrum lnatxnum, ..... 139 



Fig. 3 Staurastrum lntkyroides, Var. hexacerum, . . 137 



' 4. S iurastrum lnkyroideh, typical form, . . . 137 



Figs 5 7. Staurastrum iotanum, ..... 137 



8-9. Staurastrum Pottbii, . . . . .150 



10-12. Staurastrum meg acanthum, . . . . 121 



13-15, Comarium protuberans, Var. granulatum, . .84 



16, 17, Staurastrum toreiculatum, forma tetragona, . . 141 



is. 19, forma trigona, . . Ill 



20, 21. Staurastrum Dickiei, front and * - 1 1< 1 view, < ompare Plate XI.. 



fig8.5,fl 122 



22, 23. STAl RASTRl \l IBPINOBl M. 143 



" 24-26. Staurastrum monticulosum, .... 144 



27, 28. Staurastrum btriolatum, ..... l'ifi 



29,30. Staurastri m leptai wrm m. Var. tretroctocerom, . 151 



Fig. 31. Staurastrum exongatum, Var. tetragonum, . . . 130 



32 -35. St mi: ^strum psi i dopa< iivhiivm in m. two fronl and two end 



views, . . 125 



36, :'>7. < <>~M \i:ii M PSEUDOBROOMEI, fronl and end view. . . 36 



