zoology: marine invertebrates. 88 



morpha pe7idula has been found. The brachiopod TerebrcUulina 

 septentrionalis also has been taken, farther out. 



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

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

 larger brown Cyanea arctica also is seen occasionally. 



Ymmg Cyanea arctica. 



Aurelia flavidiila. 



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



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

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



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

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

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

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

 appear all but conducive to their existence. It is true that the 

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



