no 



BRANCH ARTHROFODA 



X (Sarcop'tes scab'ei) is the itch mite, causing the disease called the 

 itch. Still another is called the cheese-mite. 



Ticks (Ixo'des) are parasitic, blood-sucking Acarina which 

 attack man and other mammals. They do not exceed a centi- 

 meter in length, the males being the smaller. The so-called 

 " Texas fever " of cattle is transferred by the common cattle 

 tick (Fig. 81). 



L_ 



Fig. 82. — Horseshoe or king crab (slightly damaged on left). (From 

 specimen.) 



Order IV. Xiph'osu'ra. — The Lim'ulus, or horseshoe crab (Fig. 

 82), is a marine arachnid living on the bottom of the sea in 

 shallow water, creeping along in the mud and sand and feeding 



