ENTOZOA. 



387 



THE TWIN- WORM (Diplozoon Paradoxum) ; a. nat. size. 



from the middle of one to the other, reminding the 

 observer of the Siamese twins recently exhibited. 

 This strange little creature, not more than a quarter 

 of an inch in length, is found attached to the leaves 

 of the gills in the Common Bream, (Cyprinus Bra- 

 ma,} to which it adheres by suckers at each of the 

 four extremities, and from which it derives its nutri- 

 ment. 



The Thread-worms (Filaria*) are exceedingly slen- 

 der, resembling white threads, often of great length, 

 infesting the intestines of Man, as well as other 

 animals. They are found in very many species of 

 Insects, and even in their larvce. We have repeat- 

 edly extracted them from the common Earwig, 



* Filum, a thread. 



s 2 



