Diplopoda^ Paiiropoda. 



123 



SUH-ORDER IV.-IULOIDKA. 



The body is elongated and cylindrical in these millipedes, and Table-caso 

 the number of segments differs greatly in tlie various forms. Stink- ^^- ^'• 



Fi(,. 84. 

 IiiIks variiis. Natural size. (After Koch.) 



glands are present. In the male the seventh segment is limbless. 

 In the tropical regions some of the luloidea (of the families Spiro- 

 strcptidac 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 V.— POLYDESMOIDEA. 



In the milUpedes 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-oi'der is cosmopolitan ^'"^- ''^^■ 



in distrilDution ; there are several British Polydesmoid millipede, 



species, which mostly belong to the Enrydcsmus angulatus. 



^ ; "^ Slightly enlarged, 



genera Poli/desmus and Brack yacsmas. (After Saussure.) 



Class 6.-PAUROPODA. 



The members of tliis 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 



