EXPLANATION OF PLATE XXI 
Fossil Fucoids from Pogibshi Island, near Kadiak 
Village, Alaska 
Natural size 
Figs, i and 2. Helminthoj)sis magna Heer. Page 144. 
1. A small specimen of the Alaskan form of this species. The 
surface appears to be in a better state of preservation than 
on the Swiss types of the species. 
2. A small portion of a slab containing a larger and wider speci¬ 
men ; figured to show corrugations of surface. 
