360 



ZOOLOGY. 



after a moult. A typical mite, though above the average 

 size of the members of the group, is the tick (Fig. 312), 

 Ixodes albipictus Pack. Closely allied to this is Ixodes bovis 

 Riley, the cattle-tick (Fig. 313), which buries its head in 



Fig. 314. Sugar-mite. Much en- 

 larged. 



Fig. 313. Ixodesbovis. Natural size and 

 enlarged. 



Fig. 315. Amniokhoe pycnogonoides. a, 

 stomach with coeca (b, b, b, b) extending 

 into the legs. From Gegenbaur. 



Fig. S\b.Penlastoma tcenioides. 

 Natural size. From Verrill. 



the skin, anchoring itself firmly by means of the backward- 

 pointing teeth of its jaws. Other examples of mites are the 

 cheese and sugar mites (Fig. 314, Tyroglyphus sacchari). 

 The sea-mites, Pycnogonidce, are marine forms, without 



