188 SIR JOHN LUBBOCK ON PAUROPUS. 



Chilopoda, and occupy a position further removed from other Articulata even than those 

 species in which the legs are more numerous. 



It must be admitted that in some important characteristics Pauropus closely resem- 

 bles Scutiger and Lithobins ; the structure of the legs and the mandibles show, however, 

 I think, that these resemblances are analogical only, and do not indicate any close affinity. 

 In fact the Scutigeridae are, as we have seen, highly developed Chilopoda, which is by no 

 means the case with Pauropus. If, however, the Myriapods are descended from ancestors 

 having a smaller number of segments and of legs, then we must expect to find that the 

 links by which we shall eventually be able to connect not only the two great orders of 

 Centipedes together, but also the Myriapods as a whole with the other classes of Articu- 

 lata, will possess a small number of appendages. The Scutigeridae, as we have seen, do 

 not constitute such a group ; Pauropus y I think, does. 



Here perhaps it may be as well that I should quote the distinctive peculiarities which 

 characterize the two known orders of Myriapoda *, the Chilopods and Diplopods ; of which 

 the first are active and carnivorous, the second, on the contrary, sluggish vegetarians. 



Chilopods. Antennae 14-jointed at least. One pair of legs modified into powerful j 



feet. Generative organs opening at the posterior extremity of the body. Leg! 



le pairs 



Diplopods. Antenna? with not more than seven segments. No jaw-feet. Apertures 



of the generative organs in the anterior part of the body. Legs, after the first six, 

 arranged in double pairs. 



Fauropus is, as already mentioned, a neat, active little creature, and at first sight 

 certainly looks like a Chilopod : indeed the compactness of the body, the dorsal plates, 

 and the elongation of the posterior legs give it much resemblance to a small Lithobms. 

 A closer examination, however, at once shows that it differs in very important points 

 from the Chilopods : the antennae possess only five segments, the powerful jaw-feet are 

 absent, and I believe that the openings of the generative organs are situated in the 

 anterior part of the body. 



», *I « %m Z* n6W • 8eDUS . find a more natural P lace amon 8 «» Diplopods. It is true 



hat the eight posterior legs correspond to four dorsal segments ; nevertheless it is evident 

 that m reahty each pair belongs to a separate segment, as may clearly be seen if we look 

 at the anima from the underside, as in Plate X. fig. 2. It may be said that, in one 

 sense, this is true of the Diplopods ; but they always have the pairs of legs attached by 

 twos which is not the case in Fauropus, where, as will be seen by the figure, they arc 

 equidistant Moreover m all Diplopods the first three pairs of legs are distinguished 

 from the rest by being each attached to a single apparent segment, whereas in Fauropus 



S " ° n X, CaSe ™,t the flrSt ^ A S ain > in "* diplopods the legs are equal in 



2 n 1 1S ^ erenCe ' ^ P ° Steri0r P airs are »«"* smaller than the others, 



while in the present genus they are decidedly larger. In all Diplopods, again, the feet 



* I omit for the present the sartorial Mvri.pods, vvhieh require further study. 



