PLATE XXVIII 



PAGE 



Figs. 1, 2. CBYPTOZOON PBOLIFEKUM Hall 189 



1. Edge view of a fragment showing the varying diameter of the 



bodies formed by the undulating layers in this species. At 

 the top the laminae are less undulating and in fact become 

 almost horizontal. This upper portion represents the beginning 

 of a new growth of the organism. 



2. Photograph of a fragment illustrating the view which would be 



seen in a cross-section taken through the middle line of Fig. 1. 

 The variable diameter of the concentric masses is characteristic. 

 Cambrian (Ozarkian), Conococheague. Near crossing of the 

 Norfolk and Western Railroad and turnpike, one mile south- 

 west of Antietam Station, Maryland. 



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