PLATE LIII. 




Tiere Ray 
Page 
Figs. 496 and 497. . Oedogonium concatenatum v. rectangulare Rich. (After 
RES 2, ing a= 8 Son sn oe ae ae ea: eee 137 
. Figs. 498 and 499. Oe. elegans West and West. (After West).........------. 138 
Fig. 500. Oe. areschougii Wittr. (After Wittrock)............-..--.-+--+--: 140 
Fig. 501. Oe. areschougii v. americanum Tiffany...........-...------+------- 140 
Figs. 502 and 503. Oe. areschougiif. robustum Hirn. (Redrawn from Hirn). .140 
Figs. 504 and 505. Oe. bengalense Hirn. (Redrawn from Ec ere 139 
Figs. 506 and 507. Oe. rigidum Hirn. (Redrawn from Hirn)............-..-. 139 
242 
a. 
