THE RIM OF THE REEF — DAWSON 



367 



Figure 1. — Bossiella, with segments of wingnut shape, is found in California coastal waters. 

 Figure 2. — Jania genus includes this species of dainty, branched red alga of warm waters. 



one species may dominate a region to the near exclusion of other forms 

 of vegetable life. 



Despite the rigidity and often brittle character of many calcareous 

 algae, the structural differences from the usual, fleshy forms are 

 essentially eliminated by the application of a few drops of hydro- 

 chloric acid. Removal of the carbonate reveals the typical cellular 

 structure of the plant, hitherto obscured by encrustation. 



672-174—63- 



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