Johnson : Morphological Trends among Fossil Algae 433 



other types of the chrysophyceae and the siUcoflagellates, and because my work 

 has been largely with the megascopic limestone building forms, I cannot refrain 

 from discussing them briefly. (From the point of view of evolutionary trends 



Table 4 

 Methods of Preservation of Fossil Algae 



Table 5 

 Groups with Fossil Representatives 



these are of interest as they have made much of their development since Cam- 

 brian time with a fair fossil record to document the development.) 



Megascopic fossil algae. The remains of multicellular algae, as well as micro- 

 scopical ones, may be preserved in a number of ways. The nature of the fossils, 

 resulting from the way in which they were formed and preserved, is of great 



