230 ROBERTSON [3 22 ] 



Local distribution. Sitka, 10 fms. 



Foreign distribution. Britain ; Heligoland ; Ostend ; Roscoff ; 

 Adriatic ; Florida, deep water ; Madeira ; Cape of Good Hope. 



Family CELLARIIDsE. 



CELLARIA Lamouroux. 

 CELLARIA BOREALIS Busk. 



Cellaria borealis SMITT ('67), pi. xx, fig. 17. 

 Salicornaria borealis BUSK ('55), pi. i, figs. 1-3. 



Habitat. Abundant on rocks. 



Local distribution. Yakutat; Orca, Prince William Sound; Hous- 

 ton-Stewart Channel, Cumshewa Harbor, Virago Sound, Queen 

 Charlotte Islands. 



Foreign distribution . Green land. 



This fine species is very abundant at Orca, where it grows in thick 

 masses three or four inches in height. The branching is very profuse 

 in the younger portions of the colony. In the older portion, the first 

 six or eight internodes form an articulated stem without lateral branch- 

 ing. At the point where it begins, three and sometimes four inter- 

 nodes arise from the distal end of one. Above this the branching is 

 dichotomous, while the tallest internodes are tipped with three or four 

 very small ones. The young, actively growing portion is conspicuous 

 for its bright flesh-color, which causes it to stand out boldly against 

 the dark background of rock. 



Family FL USTRID^. 



FLUSTRA Linnaeus. 



FLUSTRA LICHENOIDES sp. nov. 



(PI. XX, figs. 7, 7*, 8.) 



Habitat. Upon shells, worm tubes, ascidians, and upon the rocks 

 at low tide. 



Local distribution. Yakutat ; Orca, Prince William Sound ; Puget 

 Sound ; Point Cavallo, California. 



Zoarium unilaminar, consisting of broad, foliaceous fronds. 

 Zo2cia in alternate rows, arched above, narrowed below, the upper 

 margin of the cell raised and armed on each side with three or four 

 spines ; the uppermost spine on each side stands upright and stiff, the 

 other two or three are flattened and bend inward, the ends frequently 

 meeting. CEcia globose. Avicularia none. Radical fibers, by which 

 the fronds are attached, growing from the under side of the zoecia. 



