Chap. II] 



MARINE VEGETATION 



801 



fathoms, and a few other species at similar depths. There are no observa- 

 tions regarding the undoubtedly more abundant microphytes of the dysphotic 

 region. 



Fig. 490. Alaria dolichorhachis, young. Three-fifths natural size. After Kjellman. 



In their periodic phenomena, arctic Algae resemble north temperate 

 ones ; yet there are no species whose complete cycle of development 



SCHIMTER 2 F 



