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THE OCEAN WORLD. 



most admirably rough-shod, to give ' the soldier ' a firm footing when 

 he makes his sortie, or to add to the resistance of the crustaceous 

 holders at the end of his abdomen or tail when he is attacked, and 

 wislies to withdraw into his castle. On passing the finger down- 



Fig. 345. — Pagurus Bernhardus. i, out of the shell ; b, m the shell ; a, right foot-jaw. 



wards over the terminations of these feet, they feel smooth ; but if 

 the finger be passed upwards, the roughness is instandy perceived. 

 The same sort of structure (it is as rough as a file) is to be seen in 

 the smaller caudal holders." In another species of Pagurus, from 

 the Mauritius, which was nearly n foot in length, he found a great 

 number of trans\erse rows, armed with acetabula, or suckers ; these, 



4 



