PLATE LV. 



FIGS. 

 1 and 2. Aplidium melleum sp. nov. (p. 26) 1. Colonies : 



natural size. 2. A single colony : x 2. 

 3-6. Aplidium glomeratum sp. nov. (p. 27) 3-5. 

 Colonies : natural size, slightly enlarged, and x 2. 

 6. Section through a colony : x 2. 

 7-9. ? A^liilitun mdans Johnst. (p. 27) Colonies: 



natural size. (See footnote on p. 29.) 



10-12. Didemmim sps. (p. 35) 10 and 12. Colonies: 

 natural size. 1J. A larva (of the species 

 depicted in fig. 10) : magnified. 



13. Diatoma vitreum M. Sai-s. (p. 43) A cluster of 

 colonies : natural size. 



