EXPLANATION OF PLATE XV 
Fossil Fucoids from Woody Island, near Kadiak, Alaska 
Four-fifths natural size 
The greater part of a slab of slate nearly covered with two species 
of Palceodictyon described on page 137. The larger form (1) is P. 
magnum laxum sp. nov., the smaller (2) P. singulare Heer. 
