4° 



OUTLINES OF NATURAL HISTORY, 



officiating as jaws, these hooked fangs are really to be 

 regarded as being modified legs or "feet," and they are, 

 therefore, called "foot-jaws." 



Fig. 16.— A, Lithohiua forficatus, enlarged, and viewed from above; an An- 

 tenna; /Foot-jaws; h Head. B, Head of Lithobius Leachii, viewed 

 from below (after Newport); an Antennas; / Hooked foot-iaws; I Lower 

 lip, composed of two pieces. C, Head of Lithobius forficatus, viewed 

 from above (after Gervais); an Antenna; e Eye. 



■ Behind the foot-jaws, the body exhibits fifteen distinct 

 rings, alternately large and small (fig. 16, A), and each of 

 these rings carries a pair of jointed legs. There are there- 

 fore fifteen pairs of legs, of which the hindmost are longer 

 than the others, and are directed backwards in the line of 

 the body, so as to form a kind of tail. 



