Diplopoda. 
and large tnfts of similar hairs project from the sides of each Table-case 
segment ; the last segment is furnished with a tuft of long hairs. ^°’ 
The mouth-parts consist of paired mandibles, 
Fig. 82. 
Polyxenus lagurus, the 
English bristly milli- 
pede, x 12. 
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, Polyxenidae, with two genera; one 
species (Polyxenus lagurus) occurs in this 
country. 
Sub-class II.— CHILOGNATHA. 
The 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. 
Order 1.— Oniscomorpha. 
The body is short and stout in the Oniscomorpha, and there 
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 tubes 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 
Glomeris marginata, the 
Pill-Millipede, occurs in Great Britain and Ireland. In Southern 
Europe a large number of sub-species and varieties of Glomeris 
Fig. 83. 
Sphaerotherium punctatum (slightly 
enlarged). 
