ZOOLOGY : MARINE INVERTEBRATES. 83 



morpha pendula has been found. The brachiopod Terebratulina 

 septentrionalis also has been taken, farther out. 



During the summer months, the common white jelly fish, Aurelia 

 flavidula, always may be seen in the water near the tide-way. The 

 larger brown Cyanea arctica also is seen occasionally. 



Young Cyanea arctica. 



Aurelia fiavidnla. 



(After Fewkes, by courtesy of the Essex Institute.) 



. Rocky shore faunas, comprising the rocky cliff fades of the 

 Littoral zone, and the tide-pool fades of the Laminarian zone. 



The rocky cliff facies of the Littoral zone is characterized every- 

 where by the abundant growth of the rockweed Fucus and Asco- 

 phyllum. (See page 97.) On and under these rockweeds many 

 animals find a congenial place of abode, in situations that would 

 appearjall but conducive to their existence. It is true that the 

 rockweed breaks the force of the wave-impact, which otherwise 



