NO. 2 PRE-C AM BRIAN ALGONKIAN ALGAL FLORA 155 



Beltiiia danai Walcott — Continued. 

 Fig. i6. (Natural size.) Jointed appendages very much compressed 

 and distorted. U. S. National Museum, Catalogue No. 

 33790. 



17. (Natural size.) Jointed appendage. U. S. National Mu- 



seum, Catalogue No. 33790. 



18. (Natural size.) Telson preserving a central ridge. U. S. 



National Museum, Catalogue No. 33790. 



The specimens represented on this plate are from the Algonkian : 

 Greyson shales ; Deep Creek Canyon, near Glenwood, and Sawmill 

 Canyon, 4 miles (6.4 km.) above Neihart, Cascade County, Montana. 



This plate was published as plate 25, Bull. Geol. Soc. America, 

 Vol. ID, i8q8, Walcott : Pre-Cambrian Fossilif erous Formations. 



