WORMS. 
121 
G. fulgur, or " Lightning Snake," from Celebes. Another very large 
Nematode is the so-called G-uinea-worm, or Dracunculus medinensis, 
Fig. 17. 
Gordius escaping from a Mantid. 
which is found beneath the skin of the leg ; it is very possible that 
this worm was the cause of the illness which afflicted the Israelites in 
their journey through the desert from Egypt to the Promised Land. 
Fig. 18. 
Figure of '^Trichina spiralis, showing the worms encysted in muscle. 
Of all Nematodes the most dangerous to man is the small worm 
which is known as Trichina spiralis (Fig. 18) ; a series of models are 
