264 University of California Publications in Zoology. [Vol.6 



extending between the radiating rows of zooeeia. Oceciopore 

 (oep.) flaring. 



This species is usually ascribed to Fabricius and doubtfully 

 to Linnaeus. It seems to be a strictly Arctic form, and the only 

 specimens in this collection were found growing on Flustrella 

 from Pribilof Islands, Behring Sea, collected on shore at low tide. 



Wellesley College, 



Wellt sic a, Mass., August, 1909. 



