4^12 ENTOZOA. 



4. GORDIUS AQUATIOUS. 



G. aquaticus, Grmelin ; Cuvier ; Baird ; etc. 



G. seta, Miiller ; Diesing. 



Setapalustris, Plancus. 



Vitulus aquaticus, Seta, Aldrovandus. 



Amphistoma aquatica, v. a., Seta, Conrad Gesner. 



Lumbricus aquaticus, Klein. 



Filaria Locustce, Schrank ; Rudolplii ; Fitzinger ; etc. 



F. Ditisci marginalis. Yon Siebold. 



F. Grijlli, Gmelin; Zeder. 



? Ophiostoma Pontierii, Oloquet ; Ohiaje ; Bremser. 



? Nematoideum hominis, Be Gland ; Leveille ; Clesius. 



From the evidence wliicli lias already been adduced respecting 

 the introduction of peculiar worm-like bodies into the urine or 

 bladder, with the view to deception, no one need be in the slightest 

 degree surprised to learn that the common little hairworm of our 

 ditches, ponds, lakes, and freshwater streams occasionally finds its 

 way into the chamber-utensil. Interesting as it might prove, there 

 is here no necessity to enter into the habits and life-history of this 

 little nematode ; but it may as well be mentioned, in passing, that 

 although not a human helminth, the Gordius aquaticus is a true 

 entozoon, inasmuch as it takes up a temporary residence in the 

 bodies of various insects. The medical practitioner would do well 

 to familiarise himself with its appearance, since it is not an uncom- 

 mon trick with young people to procure the worm for purpose of 

 puzzling the doctor. In the Museum adjoining the Middlesex 

 Hospital we have a Gordius which was brought to an M.D. (since 

 deceased), who, notwithstanding his eminence as a physician, was 

 induced to believe that the worm in question was a genuine Dra- 

 cunculus. It is said, moreover, that he paid four guineas for the 

 specimen ! Some twenty years ago, I remember to have seen 



