PLATE. LV. 
SO MICRONS 

Figs. 516 and 517. Oedogonium longicolie Nord.; Hirn. (After Nordstedt)...144 
Figs. 518 and 519. Oe. longicolle v. senegalense Nord. (After Nordstedt)....144 
Biss 5205 sOewdecipiensawWittr, (Atter Wittrock) = ae a sense eee 145 
Figs. 521 and 522. Oe. decipiens f. dissimile Hirn............... tis. Satay Ce 145 
Figs. 523 and 524. Oe. decipiens v. africanum Tiffany. (Redrawn from Hirn).145 
Fig. 525. Oe. decipiens v. bernardense (Bates) Hirn. (Redrawn from Hirn). .146 
Biz, 526. (Oe. rothil (Le/@l) Pringsh: . (After -Pringsheim)eye es eee eee 144 
Figs. 527 and 528. Oe. macrospermum West and West...................-...-146 
Biz. 529, (Oes uleanum! Eine) \(Redrawnitrom Harn) 2... 22s en ae 170 
2 Rie. 5305) Oe. bahusienseyNordst, j(AiitemiNordstedt). .. essence see eee 142 
Fig. 531. Oc. bahusiense Nordst., oogonium seen from above................. 142 
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