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CALIFORNIA ACADEMY OF SCIENCES. [Proc. 30 Ser. 



numerous expeditions along the coast can lead to a definite 

 conclusion. But the occurrence of a variety designated by 

 us as P. miniata f. cuneiformis is an undoubted fact. It 

 has been collected in the Gulf of Alaska (60° N. lat.), at 

 Coupeville, Washington, and as far south as Monterey Bay, 

 California (36° 45' N. lat.). 



P. abyssicola is reported by Kjellman and others from the 

 north coast of Norway and Russia and from Greenland. 

 What the author believes to be P. ahyssicoUi has been col- 

 lected on the Pacific Coast at Whidby Island, Washington 

 (48° 10' N. lat.). 



Five species of Porfhyra appear to be peculiar to the 

 Pacific Coast. In some cases it is possible to ascribe a 

 reason for this. P. iiereocystis, which as far as can be 

 judged selects Nereocystis liitkeana exclusively as its host- 

 plant, is necessarily limited to the region of distribution of 

 this species of Nereocystis. It has been reported from St. 

 Paul, Kadiak Island (57° 30' N. lat.), from Coupeville, 

 Washington, and from the Californian shores (33^40' N.lat.). 



P. naiadam, growing on Zosiera and Phyllospadix, seems 

 limited to the Pacific Coast. Though other species of 

 Porphyra occur on Zostera, both in Europe and on American 

 shores, yet no case is known to the author where P. naiadwn 

 was found growing on eel-grass in waters other than those 

 of the Pacific, where it extends from Coupeville, Washing- 

 ton (48° 10' N. lat.) to San Diego, California (32° 20' N. 

 lat.). 



P. -perforata, so closely allied to P. laciniata, attains 

 nearly the same northern latitude as the latter species, but 

 extends far lower down the Pacific Coast. Of the two 

 varieties of this species the author has been able to find 

 only one, P. -perforata f. lanceolata, at San Francisco and 

 at Monterey, while the other occurs from Washington to 

 Mexico (San Roque) (47° 30-27° ^%' N. lat.). 



P. variegata was first found by Kjellman at Bering 

 Island (Vega Expedition). Since then it has been reported 

 by various collectors along the Pacific Coast, from Whidby 

 Island,Washington, to San Pedro, California (48° 10-33° 4°' 

 N. lat.). 



