a Alga d/m/g 1, Ectocarpus sp. 6255 2. Lyngbia majuscula 3366 3. Hormothamnion enteromorphoides 3334 4, Dictyota major 3309 5. Microdictyon japonicum 2392 6. Polysiphonaceous type 2287 7. Bryopsis pennatifida 1386 8. Cladophora luteola 9, Caulerpa racemosa var. uvifera 90l 10. Halimeda sp. 426 ll, Caulerpa racemosa ° RAISON ae ARPoe YES -116- 7 AECD~3446 1060 42 Although most of the succulent forms appear at the top of the list, an exception is Caulerpa. It might be expected that Halimeda, a coralline alga, would be of relatively low activity because of its high percentage of calcareous material. Thereis little correlation of activity with phylogenetic sequence as shown in the present data (see Table 4).. However, the relationship may be obscured by the fact that all species were not available in all areas, and the data are from collections in all areas, both active and inactive. A more extensive collection would be necessary before any valid conclusions could be made. A comparison between algae activity in 1948 and that in 1949 is given below: £