NO. 2 PRE-CAMBRIAN ALGONKIAN ALGAL FLORA IO7 



than in other species. The two fragments known indicate a greater 

 diameter and thickness than for any other species of the genus. 



Formation and locality. — (400c) Algonkian, Beltian series: New- 

 land limestone; eastern slope of Big Belt Mountains, 8 miles (12.8 

 km.) west of White Sulphur Springs, at forks of Birch Creek, 

 Meagher County, Montana. 



KINNEYIA, new genus 



Body built up of thin, subparallel layers separated by narrow 

 intervals that are not much greater than the thickness of the layers 

 forming the body. 



This form differs from Newlandia in its finely laminated arrange- 

 ment of its layers and interspaces and the marked bifurcation of the 

 layers forming the body. 



Genotype. — Kinneyia simulaiis, new species. 



As far as known the geographic distribution and the stratigraphic 

 range are the same as for Ncidandia. 



KINNEYIA SIMULANS, new species 



Plate II, fig. 3 



There are several specimens of this species that have the char- 

 acters shown by fig. 3, of plate 11, which is the upper etched surface 

 of a block 22 mm. in thickness down through which the layers form- 

 ing the body extend almost vertically. The layers of some of the 

 specimens are a little coarser than those represented by fig. 3, plate 

 II, but they have the same character. 



The mode of growth was probably much like that of Newlandia 

 frondosa. 



Formation and locality. — (400c) Algonkian. Beltian series: New- 

 land limestone; eastern slope of Big Belt Mountains, 8 miles (12.8 

 km.) west of White Sulphur Mountains, at forks of Birch Creek, 

 Meagher County, Montana. 



WEEDIA, new genus 



Irregular, encrusting, and solid deposits that gathered as tuber- 

 cles, ridges, and many irregular forms on the bed of the body of 

 water in which the algae forming them lived. The specimens sug- 

 gest a secondary siliceous deposit in the limestones, but the concen- 

 tric laminated structure of the tubercles points more strongly to an 

 origin similar to that of the encrustations made through the agency 

 of the Blue-green algae (Cyanophyceae). 

 3 



