PLATE VII. 



Fig. I. Scirpearella gracilis W. and S. Fairly large colony, with calyces on all sides. Natural size. 



\a, part of colony X 5- 

 Figs. 2, 3 and 4. Smaller colonies of the same species, with alternate calyces. Natural size. 3^, part of 



colony X 5. 

 Fig. 5. A very young colony, same species, with very regular lateral and alternate calyces. 



