io8 THE LIFE OF CRUSTACEA 



high-water mark ; but in warmer climates species of 

 TaHtridse live in the damp forests at great distances 

 from the sea, and deserve to be ranked among the 

 terrestrial Crustacea. 



It has been mentioned above that the Common 

 Shrimp is protected, not only by its habit of lying 

 half buried in sand, but also by its close resemblance 

 in colour to the sand among which it lives. There 



Fig. 39 — The Common Sand-hopper (Talitms saltator), Male, 

 FROM the Side, x 3. (After Sars.) 



are many others among the shore Crustacea which 

 show what seems to be a ''protective resemblance" 

 in colour and form to their surroundings. It is 

 necessary to be cautious in interpreting these re- 

 semblances as necessarily protective, since the fish 

 and other enemies which prey on these Crustacea 

 see them with eyes very different from ours, and 

 probably, in many cases, are guided to their prey by 

 the sense of smell rather than by sight. The 

 '' masking " habit of the Spider Crabs, already 



