D ip lop o da , Pauropoda. 
Sub-order IV. — IULOIDEA. 
123 
The body is elongated and cylindrical in these millipedes, and Table-case 
the number of segments differs greatly in the various forms. Stink- No - 27 • 
Fig. 84. 
lulus varius. Natural size. (After Koch.) 
glands are present. In the male the seventh segment is limbless. 
In the tropical regions some of the Iuloidea (of the families Spiro- 
streptidae and Spirobolidae ) are of large size, one or two species 
reaching a length of over ten inches. There are numerous repre- 
sentatives in temperate countries. A 
number of species occur in this country, 
and several of them are injurious to 
vegetation. 
Sub-order Y. — POLYDESMOIDEA. 
In the millipedes belonging to this 
sub-order the body is either long or short, 
cylindrical or rather flattened above, and 
is often furnished with keels : the number 
of segments is constant, and is either 
nineteen or twenty, the seventh segment 
of the male being furnished with a single 
pair of feet. The species which inhabit 
temperate countries are of small size, but 
the tropical species ( Platyrrhachus , etc.) 
are often of large size and beautifully 
coloured. The sub-order is cosmopolitan 
in distribution ; there are several British 
species, which mostly belong to the 
genera Polydesmus and Brachydesmus. 
Fig. 85. 
Polydesmoid millipede, 
Eurydesmus angulatus. 
Slightly enlarged. 
(After Saussure.) 
Class 6.— PAUROPODA. 
The members of this class differ from the Diplopoda in having 
branched antennae. They are all very minute animals, mostly 
measuring less than one -twentieth of an inch. The body-segments 
