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 (i) is P. 

 magnum laxum sp. nov., the smaller (2) P. singulare Heer. 



