156 FIRST BOOK OF ZOOLOGY. 



and mouth, at one end, and the sucker at the hinder end. 

 The body being nearly transparent, the internal organs show 

 through. 



The species of worms in fresh water are few in number 

 and quite small. The ocean seems to be their true home, 

 all along the sea-coast occur a great variety of worms, many 

 of them of large size. 



141. Pupils who have access to the sea-coast may collect 

 them between high and low water mark. Certain species 

 may be obtained by turning over stones and others by dig- 

 ging either in muddy or sandy places. After a violent storm 

 from the ocean, many kinds of worms are thrown up, and 

 may be found in pools left by the receding tide. The roots 

 of large sea-weeds also afford shelter to certain kinds. All 

 of these creatures may be kept alive for a few days, 

 though considerable care is required, and those not experi- 

 enced in keeping salt-water aquaria are warned to exclude 

 these animals. 



They may be best studied by being placed in shallow 

 bowls or plates, and there will be much to admire in their 

 graceful motions and curious ways. 



142. A very common form is found under stones at low 

 tide. The body is composed of a great many segments, 

 from the sides of which project little appendages of various 

 shapes, and also bunches of bristles which can be plainly 

 seen as the creature moves. The head, instead of being 

 simple -as in the earthworm, is surmounted by various 

 feelers. 



