PLATE XVII. 

 [Proc. Wash. Acad. Sci., Vol. Ill, PI. L.] 



FIG. i. Laminarta cwneif&fia J. Ag: 



2. Mesogl&ia simplex sp. nov. 



3. " " section (X 100). 

 4- " (X400). 



[462] (226) 



