SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 5 



PAGE 



Section of Lake Ball formed by Blue-green algse. (See pi. 4) 100 



Fig. I. (X 4) Transverse section of an elongated ball, showing 

 laminated structure and the presence of several nuclei 

 toward the center of the section. U. S. National Museum, 

 Catalogue No. 60693. 

 Locality Squaw Island, Canandaigua Lake, N. Y. 



Newlandia concentrica Walcott lOS 



Fig. 2. (Natural size.) View of upper portion of concentrically ar- 

 ranged laminations as exposed by natural weathering, U. 

 S. National Museum, Catalogue No. 60694. 

 3. (Natural size.) Upper surface showing concentric lamina- 

 tions exposed by the removing of the limestone by acid. 

 U. S. National Museum, Catalogue No. 60695. 



Newlandia frandosa Walcott (See pis. 6-8) 105 



Fig. 4. (Natural size.) This specimen illustrates a concentric struc- 

 ture toward the center with laminations to the right and left 

 that are cut off at top and bottom by the surface of the 

 layer of limestone in which they occur. V. S. National 

 Museum. Catalogue No. 60696. 

 The specimens represented by figs. 2-4 are from locality 400c: 

 Algonkian; Newland limestone; 8 miles (12.8 km.) west of White 

 Sulphur Springs, ^leagher County, Montana. 



