THE BARNACLES 



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they are distinct and movable. The abdomen consists of eight movable segments, 

 or two in excess of the normal number; but there are only nineteen pairs of append- 

 ages. The head bears a small, movable rostrum, and a pair of stalked eyes. The 

 two pairs of antennae are well developed, and there are three pairs of jaws. The 

 appendages of the thorax are foliaceous. The members of this group are marine, 

 and widely distributed, being found in cold and warm latitudes. The female carries 

 the eggs attached to her thoracic feet. 



SUBCLASS Entomostraca 



The Crustaceans of this division are small, and vary much more than the 

 Malacostraca, from which they differ in the following features: The number of 

 body segments is not constant, but either greater or less than nineteen, and, as a 

 rule, there are no appendages to the abdomen. In the majority of cases the young 

 are hatched as a Nauplius. 



THE BARNACLES Order CIRRIPEDIA 



The adult members of this group are so unlike typical .Crustaceans that it can 

 hardly be a reproach to the older naturalists that they failed to discover their affin- 

 ity. Two well-known members of the order are the barnacles so frequently attached 



BARNACLES ATTACHED TO PUMICE. 



