SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 75, NO. 5, PL. 57 



Fig. I. — Collcnia f prolifica, new species. Nearer 

 view of a few of the columns, illustrating their 

 mode of growth, form, and occurrence. 



Fig. 2. — Collenia ? prolifica, new species. Illustrates a bed of large 

 columns underlain by a very evenly arranged bed of smaller columns. 

 Formation and locality. — Same as plate 56. 



