Diplopoda. 



Vl\ 



No. 27. 



and large tufts of similar hairs project from the sides of each Table-case 

 segment ; the last segment is fm^nished with a tuft of long hairs. 

 The mouth-parts consist of paired mandibles, 

 maxillulae and maxillae and a labium. 



These curious little millipedes are widely 

 distributed, and live beneath stones or 

 the bark of trees. There is a single 

 family, Polyxenidac, with two genera ; one 

 species (PoJyxcnns l((ijnrus) occurs in this 

 country. 



Sub-class II.— CHILOGNATHA. 



Tlie body of the Chilognatha is" hard and 

 strongly chitinized, and is not furnished 

 with tufts of scale-like hairs. The maxillae 

 usually fuse to form a complicated gnatho- 

 chilarium. 



There are three orders of Chilognatha. 



Fig. 82. 



Polyxenus lagiirus, the 

 English bristly milli- 

 pede, X 12. 



Order 1. Oniscomorpha. 



The body is short and stout in the Oniscomorpha, and thei-e 

 are eleven, twelve or thirteen dorsal plates, the last of them being 

 of large size. The copulatory feet of the male are situated on the 

 penultimate segment. The tracheal tulles are branched, and there 

 are no stink-glands. 



In general appearance 

 the smaller species resemble 

 closely the "wood-lice," 

 which belong to the widely 

 different group of the Crus- 

 tacea Isopoda (see p. 43), 

 and, like them, are able to 

 roll themselves into a ball. 

 They are widely distributed, 

 but are very rare in America. 

 The typical dark variety of 

 (rloiiieris vianjinata, the 



Pill-Millipede, occurs in Great Britain and Ireland. h\ Southern 

 Europe a large number of sul)-species and varieties of Glomcris 



^^mm 



T 



Fig. 83. 



Sphacrotherium ininctatnm (slightly 

 enlarged). 



