WORMS. 



157 



Another species very common on the sea-shore, under 

 stones, is much shorter than the one just described. It has 

 two i-ows of oval scales along the back, and the mouth is fur- 



.\ 



Fig. 144.— a Common Sea-Wobm. 



nished with powerful jaws, which work up and down. When 

 they are placed in alcohol these jaws generally protrude. 



143. Some species have a curious way of protruding 

 their oesophagus when they seize their food, at the end of 



Fig. 145. — A Sea- Worm with Scales. — The eyes may be seen, four m number, between the 



forward scales. 



which appear the jaws, like sharp claw-shaped teeth. The 

 following iigure shows the anterior end of one of these 

 worms, with the oesophagus protruded, in the act of se- 

 curing its prey. 



Certain other sea-worms build tubes of mud or sand 

 in which they live, and many of tliese have btmches of 



