46 THE WORMS. 



worm-like polyzoan. They are the commonest objects of 

 the sea-shore, and are often pressed under the name of 

 sea-mosses. Some occur in fresh water. They multiply 

 by budding and by summer and winter eggs, the young 

 of the latter being at first free swimmers. 



FIG. 45. A moss animal (Plumatella repens), 

 zooids expanded and retracted. 



FIG. 46. Brachiopod 

 showing arms. 



Class V. LAMP SHELLS (Brackiopoda\ 



The Brachiopods (Fig. 46) are worms that secrete 

 unequivalved shells with or without hinges. The arms are 

 on each side of the mouth, and in some appear in spirals 

 supported by loops. By the motion of the fringes of the 

 arms, food is thrown into the mouth ; they are also re- 

 spiratory organs. The Lingula (Fig. 47) is an example 



FlG. 47. Lingula anatina. 



common in the sand south of Cape Charles, where they 

 make sand-tubes about their peduncles or stems. The 

 young are at first free swimmers by means of cilia. Allied 



