(85) 



in Ceramiinn it is within, the middle stratmn of hirge cells is entirely 

 wanting, and in most of the species the small cells only extend a little 

 way on each side of the dissepiment. 



EXPLANATION OF PLATE XCIX. 



Fig. 1. — Microdadia glandulosa, natural size. 

 2. — Branchlet with favella. 

 3. — Branchlet with tetraspores. 

 4.- — Tetraspores. 

 5. — Transverse section of stem. 

 6. — Longitudinal section of stem. All magnified. 



