PARASITES FREE WHILE YOUNG. 147 



without exception, the small ones as well as those which 

 were larger, a couple of these parasites in their stomach. 

 We allude to it here, but we might as well call this 

 Ickthoxenus a messmate as a parasite. 



On the coast of Brittany, among the many Lahri, 

 which are distinguished for their vivacity, and for the 

 variety of their colours, is found a small species {Lahras 

 Cornuhiensis) , on which is usually seen an isopod which 

 is no less curious. It is constantly clinging to the sides 

 of this fish, not far from the head, at the bottom of a 

 hollow made under the scales. Naturalists have known 

 this acol}i;e by Mons, Hesse's works. 



This Leposphilus (for this is the name which has been 

 given to it), though it does not prefer the scales to any 

 other organ, forms a lodging for itself in the sides of 

 this little Labrus, and takes up its abode there with its 

 family. We cannot assert that it has chosen this refuge 

 without any hope of returning, since both the sexes still 

 keep their organs of locomotion. 



At the last congress of German naturalists at Wies- 

 baden, Dr. Kossmann, who has had the opportunity of 

 examining the rich materials brought from the Philippme 

 Isles by Professor Semper, gave an excellent account of 

 the result of his careful observations on some other 

 crustaceans still more remarkable, the Peltogasters of 

 which we have spoken before. In the course of this, he 

 described an isopod with a development as completely 

 recurrent as that of the peltogasters, whose rank among 

 cirrhipeds is perfectly established. 



Most of the inferior crustaceans require assistance 

 from others : some might be correctly arranged as mess- 

 mates, but the whole category of the Lerneans is so low 



