PLATE XXVII. 




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Fig. 233. Oedogonium paludosum vy. americanum Nord. (Redrawn from 
TEN figtnt) eh ae ciate scene sf cs = ay acoveverd ean atte sa.to (RUNGE eRe NST OE Cece 90 
Fig. 234. Oe. margaritiferum Nord. and Hirn. (Redrawn from Hirn)......... 92 
Figs. 235-237. Oc. exocostatum Tiffany........ Se ee oe acho 4 emo 89 
Figs. 238 and 239. Oe. urceolatum Nord. and Hirn. (Redrawn from Hirn).... 167 
