SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 6 



PAGE 



Newlaiidia frondosa Walcott. (See pis. 5, 7, 8) 105 



Fig. I. (Natural size.) Portion of the upper surface of a large frond. 

 3 cm. in thickness, as shown by fig. 3. U. S. National Mu- 

 seum, Catalogue No. 60697. 



2. (Natural size.) Lower surface of the specimen represented 



by fig. I. 



3. (Natural size.) Vertical section through the edge of the speci- 



men represented by figs, i and 2. The laminated structure 

 is toward the upper surface, the cellular structure forming 

 the lower half. 



The specimen represented by figs. 1-3 is a portion of a large 

 frond that was 48 cm. or more in diameter, with an average thick- 

 ness of 2.5 to 3 cm. 



Locality 400c: Algonkian : Newland limestone; 8 miles (12.8 

 km.) west of White Sulphur Springs, Meagher County, Montana. 



