Fig. 1. — Natural size. 



PLATE V. 

 Figs. 1-4. — Sdurella indivisa. 



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Fig. 2. — Portion of hj-drocladium, magnified ; lateral view. 



Fig. 3. — Same ; front view with gonangia. 



Fig. 4. — Internode of stem with origins of hydrocladia. 



