PLATE XXIV. 

















Fig. 208. QOedogonium crassum v. longum Transeau...................----:-- 
Figs. 209 and 210. Oe. rivulare (Le Cl.) Al. Br. (Redrawn from Hirn)....... $4 
Hiecealieancdest2. Oe. landsborourghin (Hass: eWiattienee. a: 2 .-+ oa 87 
Figs. 213 and 214. Oc. landsboroughi v. norvegicum Wittr.................... 87 
