508 



ZOOLOGY 



SECT. 



two pairs of maxillae. The mandibles have no palps; one or 

 both pairs of maxilla? usually possess palps: the second pair of 

 maxilke are in some groups more or less united together. 



The number of segments in the body varies from 12 to 173. In 

 the Millipedes the dorsal walls of the segments are very strongly 



ant 



brn 



FIG, -U'.i. Scolopendra. (Fi-.>m 



''r's .-In:':, (III K'i,,l<lri,il.) 



mal 



slont 



\ in? 



l'i'.. 4:.o. Iiithobius forficatus seen from the 

 ventral side. ant. antenna- : '/,-,. brain ; cox. ap. 



'"' f appendages; fl. l.'i, fifteenth pair of legs ; 



int. intestine; mal. ^l:il]iixlii;in tubes; mj-p. 

 maxillipedes ; ,/<. cy. iiervi.' o>nl ; us. oesophagus; 

 itom. stnuiach. (From Leuckiirt.) 



arched; in the Centipedes the segments are all dorso-ventrally 



rnmpressed, with distinct tergal and sternal shields separated 



laterally by intervals of comparatively soft skin on which the 



gmata open. In the Chilopoda each segment bears a pair of 



: of thov the mosi anterior pair is extended forwards 



