198 



C. M. CHILD AND L. H. HYMAN. 



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stage, and soon after this contraction disintegration began in the 

 stalk above the foot (Fig. 42) and progressed in both directions 

 from this level with the usual final result. 



H. oligactis differs markedly from the other two species in 

 that attached quiescent animals in all cases observed by us, with 



