158 



IXVEIJTElUiATE ANIMALS. 



leugtli of lialf a font nr more, and are cousecjueiitly able to inflict ex- 

 tremely severe ami even dangei'ous bites. Tlie true Centipedes are 

 fiu-ther distinguished liy the nnnd)er of legs not being indefinitely 



FiK. 100.— Cuntipi'iU. (Smlr.petvhi'}. 



great (usually fiom fifteen to twenty ]>airs), and by the fact that 

 the antennae are i-cjUijinsed of not less than fiiuiteeu joints eacli. 



The Millepedes (fig. 10(1) are repulsive-looking but perfectly inno- 

 I'ciit animals, "which f<;'ed ]!iinci])allv upon decaying vegetable matter. 

 The boily in the onlinary Millepedes is muuded and worm-like; 

 ;i:iil the segments are so amalgamated that each ajiparent body-ring 



ICC,. — ,Mil'i'liiMr(//.;Hi ,ii,i.,hiUf<), a siHiill (■.\,'Liiii.lr. of llir iial.lir.ll fiy.i: 



gi\'es origin to firn ])airs of minute thread-like feet. The miiuth is 

 destitute of the jiowerful jaws wliidi are found in the (.'entipedes, 

 the legs are indetniitely numerous, .-ind the antenna' .are short, and 

 ai-c couijiosed of no more th.'in six or seven joints each. 



Tlni Eiu'opea.n Millejiedi'S ai'e all of small size, but some trr)]»ical 

 s]ieci(-s ;ilt;iin ;i length ()f from six to ten imhes. 



,\ liiird group, undi-r the name of I'uiiriiiuKhi, h;iK been estab- 

 lished for a, euilous Idlle cre:d.nre calli'd I'liiiro/iiix. ]n this, the 

 body consists .jf oidy ten seenn'nts, .•iiid then- .-ire no niore than nine 

 ]i.-iirs of legs. I'he .anlcnn.-e ;in' ti\e-jninted, forked, and provided 

 \\'ith jointed .aiipeuil'igi'S. I'here .-n'e no I rache.'c, and respiration is 

 e:irried on by the skin. It is \-ery sm;dl, ,'ind is found inhabiting 

 (hvayi'd li'.-iA-es ami il.-inip situations. 



Lastly, a fourth gi'oup, ti'nned ()iiiirl,,iiiliiir<i, containing only the 

 euiious .-inim.'ds (.f the genus I'lriiMiliis (tig. ]()7), must be .-nlmitteil, 

 )iro\ isioiially .-it any rate, a.mongst the MiirinjnnlK. The species of 

 J'rrijKdii- ;ne worm-like animals fouiiil in moist situations or under 



