42 



THE BRITISH WOODLICE. 



When we examine the abdomen, we find that the appendages 

 are plate-like, with the exception of the last pair (fig. 13), and 



/?07ZS/xZ Plate 



FIG. 9. — THE ' ; UPPER LIP. 



{Oiuscns asellus ) 



FIG IO. — THE ''LOWER LII 



(Oniscus aselhis.) 



FIG. II. — A TYPICAL THORACIC SEGMENT 



(Oniscus asellus.) 



they all agree in having two divisions, an arrangement which 

 would prove awkward in limbs used for walking or feelinsf. 



Body caf>ify\ 

 (wdk Vcdcera, \ 

 removed) 



Jtoz&al pfa& 



plode 



Left, 



plate of \ 

 drvod poucffi 

 (oosCegde) 



BROOD POUCH 



\J containing &}<&>) 1 



fios-tftoro of &fe 

 cpew/u/ <fffie oviduct 



\J$asaZ 



of5£fa?7d) 

 wcd&np leg 



FIG. 12.— THE FIFTH THORACIC SEGMENT OF A FEMALE. 



(Oniscus asellus.) 



The inner plate (or endopodite) is in structure a gill, but 

 the blood that passes through it, is enabled to take up oxygen 



