EXPLANATION TO PLATE V. 



Fin. 1. firrlalariit min/eri Nutting. Basal portion of colony (enlarged). 



2. Si'i'ltt/tiriii niiii/i-ri. Distal part of stem (enlarged). 



3. Sertii/Ki-iii mnyi-ri. Side view of stem (enlarged). 



4. Sertulitriit iiinifrri. Hydrothec-;e with collapsible tubular extensions (enlarged). 



5. Seriular'iu janirtnlixi Nutting. Part of stem (enlarged). 



6. Sertulartit xtoi>/;,'i/i Nutting. Part <if stem and gonangium (enlarged). 



7. Serin/aria stuokeyi. Pair of hydrotheo.'e (greatly enlarged ). 



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