ii 4 



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 



■v-\ '■ 



Fig. 26. — A group of Burrowing Animals from a sandy shore, a. The 

 Heart-urchin, showing ils tube feel gathering food. B. A Bivalve 

 (.Stiobiai/an'a), showing the inlet (/'} for water and food and the outlet 

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

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

 Masked Crab, whose antenna: form the inhalent tube. — (B-D from 

 Messrs. Mivcr and Mobius : A, after Grahcr ; E, F, original.) 



