p o s t e i 5 i a 219 



shaped ultimate branches, upon the 

 tips of which the wrinkled laminae are 

 borne, not at first clearly to be dis- 

 tinguished from the strap-shaped stipe. 

 Great numbers of lateral outgrowths 

 are produced, those upon the stipe 

 being many of them developed as 

 swimming bladders, or as sporophylls, 

 while those upon the margins of the 

 lamina neither become swollen nor give 

 rise to sori. 



Of the preceding genera Eisenia 

 is perhaps the least abundant in the 

 Straits of Fuca. Specimens have been 

 reported, however, from the Sound, and 

 fragments ascribed to this genus were 

 collected during the winter of 1901 

 near Victoria. Thalassiophyllum does 

 not seem to be particularly abundant, 

 and only a few specimens of Chorda 

 have been seen from this locality. The 

 others are all decidedly abundant, and 



