DlCTYOSPOXGID.E. 4U3 



LYRODICTYA, Hall. 



Page 362. 

 (See Plate LVI.) 



LYRODICTYA ( { ) BuELIXGTOXEXSIS, Hall (sp.). 

 Page 357. 



Figure 6. A view of the original specimen, which is a fragment of a broadlv 

 expanded frond with strong bundles of vertical spicules, compacted 

 at the base but diffused toward the apertural portion. The reticula- 

 tion is uniformly fine. 



Burlington group (Yellow sandstones). Burlington, Iowa. 



