INTRODUCTION. 11 



Dasya elegans, the several species of the Chondriopsis, 

 the Grinnellia Americana, Rhabdonia tenera, Hypnea 

 musciformis, Champia parvula, Lomentaria Bai- 

 kyana, Spyridia filamentosa, CoUithamnion Baileyi 

 and many others. I suppose, perhaps, that from one 

 quarter to one-third of the species of each region do 

 not extend into the other, or, if they do at all, then 

 as rarities. I wiU note the geographical range of 

 each species as I describe it. There seem to be 

 no such differences in the flora of different parts of 

 Cahfomia. It is likely that nearly aU the plants that 

 could be found at San Francisco or Santa Cruz, could 

 also be found at San Diego and Santa Barbara, a few 

 rarities only excepted. It will be observed that this 

 book undertakes to give an account only of the marine 

 flora of Cahfornia on the west coast, and of New York 

 and New England on the east; though, it may be 

 added, that this will make it practically apphcable to 

 all the coast north of the Carolinas on the one side, 

 and to Vancouver Island on the other. I may also 

 add that I have included only common plants, such 

 as the beginner would be certain to meet witli in his sea 

 side excursions ; and I believe I have included nearly 

 all of these on our eastern shores. I cannot say as 

 much for the California flora. I have selected for 

 special mention only some sixty or seventy species peculiar 



