870 



without a mouth or alimentary canal, but with a large proboscis 

 Tig . m . armed with hooks, evidently lives by imbibition 



I of the fluids of its host. It is a not uncommon 

 parasite of fishes. Fig. 182 represents an al- 

 lied^) form (Koleops anguilla) described by Dr. 

 Lockwood, who found it in the eel (Ajiebican 

 Naturalist, vi, 1872). 

 Development of EchinorJiynchus gigas. Schnei- 

 der has given the only account we have of the 

 early stages of this worm. " The ova of this 

 worm are scattered upon the ground by the pigs. 

 Here they are eaten by the larvse of Melolontha 

 vulgaris [a beetle allied to our June beetle], and 

 Koieops. t h us arr ive at their further development. The 

 ova burst in the stomach of the larva, and the embryos contained 



"The larvae infested with Echinorhynchi 

 morphosis into cockchafers. . . . 

 arrived at the body cavity of the larva? of Melolontha, they re- 

 main for some days unaltered and capable of motion ; they then 

 become rigid, acquire an oval form, and envelope themselves in a 

 finely cellular cyst, which is formed of the connective tissue o 

 the larva. The skin of the embryo, with its circlet of spines a 

 the anterior extremity, continues at first to be the skin of the 

 growing larva ; and it is only at a later period, when the forma- 



