a New Genus of P lasmodiophonaceae. 
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EXPLANATION OF PLATE XXI. 
Illustrating Messrs. Ferdinandsen and Winge’s paper on Clathrosorus , a New Genus of 
Plasmodiophoraceae. 
Fig. 1. Appearance of a specimen of Campanula rapunculoides infested by Clathrosorus cam - 
panulae. Nat. size. 
Figs. 2 and 3. Young amoebae showing the characteristic nuclear divisions, anaphase and meta- 
phase respectively, x 1,680. 
Fig. 4. Multinucleate amoeba in a host cell, x 750, 
Fig. 5. Multinucleate amoeba surrounding a part of plasma and the nucleus of the host cell, 
x 750- 
Fig. 6. Aggregation of spores in a host cell, x 570. 
Fig. 7. Section through a spore ball, x 700. 
Fig. 8. Section through two mature spores, x 1,680. 
