[34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 12 



PAGE 



Camasia spongiosa Walcott. ( See pi. 9 ) . 115 



Fig. I. (Natural size.) Vertical section through the side of a large 

 block showing the vesicular character of the specimen. 

 U. S. National Museum, Catalogue .No. 60706. 

 2. (Natural size.) Vertical section of the same specimen as 

 shown by fig. i, at right angles to the section shown by 

 fig. I. The tubular openings are very irregular. 



The specimen represented by figs, i and 2 is from locality 400c: 

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

 Sulphur Springs, Meagher County, Montana. 



