ANIMAL LIFE 



they lie till the disturbance has passed away. Their 

 presence has impressed a line inside the shell, so 

 that in place of a mark running parallel with its 



FIG. 26. A group of Burrowing Animals from a sandy shore. A. The 

 Heart-urchin, showing its tube feet gathering food. B. A Bivalve 

 (Scrobicularia), showing the inlet (b) for water and food and the outlet 

 (a), c. The Cockle, showing inhalent and exhalent tubes. D. The 

 Mud-clam (Mya), showing the same. E. The Lugworm. F. The 

 Masked Crab, whose antennae form the inhalent tube. (B-D from 

 Messrs. Meyer and Mobius ; A, after Graber ; E, F, original.} 



