ENTOMOSTRACA. 369 



species of the Pln T llopoda, Cladocera, and Ostracoda 

 abound in the rocks of all countries. 



The CIRRIPEDIA or Barnacles are also covered with a 

 shell in their adult state ; and at this time they are 

 attached to rocks, shells, etc. In the young state they 

 are naked, and free to move about. The name is from 

 the Greek cirrus, a curl of hair, and from the Latin pes, 

 a foot. 



* The Hot if era, formerly placed as the lowest group of 

 the Crustacea, are now by most authors classed with 

 Vermes, where we briefly notice these minute forms. 

 1C* 



