580 



CLASS III. MYRIAPODA. 



ovary). Their Diplopod features are : their progoneate con- 

 dition, the number of their jaws, the form of their larva, and 

 their incipient diplopody. 



Of all the characters mentioned in our definition, the only 

 one which is peculiar to the class is that referring to the number 

 of legs and segments in the young at hatching, and even that 

 is not found in all Myriapods, a few of the Chilopoda being 

 hatched with the full number of segments and appendages. 



It will be observed that we make no attempt to bring the 

 head of the Diplopoda and Pauropoda into line with the general 

 scheme given on p. 325. In spite of recent work (see note p. 589) 

 we do not think that this can at present be done with any 

 advantage to Science. 



Myriapoda make their appearance in the Carboniferous in 

 form not very different from those now living. 



FIG. 346. 

 Huxlei/i 

 Latzel). 



devoid 

 jointed 



Order PAUROPODA * 



Minute progoneates with a head bearing three 

 pairs of appendages (antennae, mandibles and 

 maxillae) and with twelve trunk-segments, nine 

 of which bear legs. 



The Pauropoda are small myriapods, less 

 than two mm. in length. They possess a 

 distinct head and a body in which indications 

 of twelve segments, carrying in all nine pairs 

 of legs, can be made out (Fig. 346). The head 

 carries a pair of triflagellate antennae, a pair 

 of mandibles, and a pair of weak maxillae 

 united to form an underlip (hypostoma). It is 

 without eyes, though on each side of it there is 

 a large eye-like surface which however is 

 of ocular structure. The antennae possess a four- 

 base with two branches, of which the dorsal bears 



Pawropus 



(after 



* Lubbock J., On Pauropus, a new type of centipede, Trans. Lin. Soc., 

 26, 1866, p. 181. Latzel R., op. cit. Schmidt P.. Beitrage zur Kenntniss 

 der niederen Myriapoden, Z.f.w.Z., 59, 1895, pp. 436-507. Kenyon F. C., 

 Morphology and Classification of the Pauropoda, Tuft's College Studies, 4, 

 1895, pp. 77-146. Hansen H. J., On the genera and species of the order 

 Pauropoda, Vid. Medd. Naturh. For. Kopenhagen, 1901, pp. 323-424. 

 Silvestri P., Ordo Pauropoda, in A. Berlese Acari, Myriopoda, et Scorpiones 

 hucusque in Italia reperta, 1902. 



