690 AUSTRALIAN CRUSTACEAN FAUNA. 



Situation of Saccnlina. 

 Middle of intest. canal under 3rd segm. 



5» > ) J» ») old yy 



. On left side of intest. canal under 4th segm. 

 . Middle ,, ,, ,, ,, 5th ,, 



Though quite able to reach it with tlieir chehe, the crabs never 

 seem to interfere with the Saccxdina, apparently regarding it as 

 a part of themselves. Only by repeatedly wounding the parasites, 

 have I succeeded in making their hosts interfere with them, and 

 in one instance the crab pulled so hard that he completely dis- 

 lodged the Sacculina, thus showing that, in some instances at 

 least, it Avould be possible for the crab to remove the pai-asite, if 

 driven to it either by irritation or any other cause. 



