no 



BRANCH ARTHROPODA 



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

 itch. Still another is called the cheese-mite. 



Ticks (Ixo'dcs) are parasitic, blood-sucking Acarijia 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). 



Fig. S2. — Horseshoe or king crab (slightly damaged on left). 



spechncn.) 



(From 



Order IV. Xlph'osu'ra. — The Lii)i'uhts, or horseshoe crab (Fig. 

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

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



