\- 1 MOSSES {MUSCI) : SI' HA GNA CEA^—A NDRE^A CEA-: 1 63 



soon, however, disappears ; and finally, as is well known, they 

 lose their contents completely, and in most cases round openings 



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are formed in their walls. The protoplasm is mainly used up 

 in the formation of the spiral and ring-shaped thickenings upon 

 the inner surface of the wall, so characteristic of these cells 



