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Fic. 41.—a, Halimeda monilis half natural size; 6, the same in longitudinal 
section highly magnified. 
Callipsygma is a genus of which only an imperfect 
description has been ‘published. It appears to be 
related to Avrainvillea and Udotea. 
A fossil Alga of Devonian Age, Nematophycus, has 
