Photographs to show habit of growth. 
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PLATE XVI. 
95.—Scerupocellaria varians Hincks. — 
96.—Scrupocellaria diegensis Robertson. ane <n 
97.—Bugula neritina (Linneus) Oken. a la : 
98.—Bugula murrayana Johnston. Specimen from Orea, Al ska. my; ‘ | 
99.—Bugula murrayana Johnston. Specimen from Puget Sound. 
100.—Bugula californica Robertson. ; 
101.—Bugula pacifica Robertson. 
102.—Cellaria borealis (Rusk) Hincks. 
103.—Cellaria mandibulata Hincks. 
104.—Cellaria diffusa Robertson. 
105.—Flustra lichenoides Robertson. 
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