CYANOPHYCEJE 261 



of roundish oval or pyriform cells grouped together. 

 There is no vegetative propagation known, but the 

 cells become sporangia in the fashion described for 

 Hyella. 



The Geographical Distribution of Chroococcacece is 

 world-wide. Glceocapsa, Polycystis, Hyella, and Dermo- 

 carpa, occur in British seas. The two last genera are 

 marine only ; Hyella known only in European waters, 

 but Dermocarpa with a wider range. 



