226 



SUBKINGDOM AETICULATA. 



are harmless, and beneficial in destroying dead vegetable 

 matter. 



Julidae (down-like). The " TJwusand-legs " being slow- 

 moving, when alarmed, coils its body in a ring, with the tail 

 in the centre and the feet entirely concealed. 



SUB-CLASS III. ARACHNIDA. 



General Characteristics. The Arachnids (spider-like) 

 have the head and thorax amalgamated ; ocelli from two to 

 eight; and four pairs of legs. They molt six times in 

 coming to maturity, but undergo no metamorphosis. 



ARACHNIDA.^ 



ABDOMEN WITHOUT SEGMENTS AND JOINED BY 



A SLENDER PEDICEL TO THE 



CErHALO-THORAX. 



ABDOMEN WITH SEGMENTS AND INDISTINCTLY 

 UNITED TO THE CEPHALO-THORAX. 



ABDOMEN WITHOUT SEGMENTS AND MERG 

 WITH THE CEPHALO-THORAX. 



>- Aranese, 



> Pedipalpi, Scorpion, etc. 

 ED L Acarina, Mite, etc. 



ORDER ARANE^E, 



General Characteristics. Spiders have neither com- 

 pound eyes nor antennae. They possess a prehensile organ, 

 with a hook at the end, through which issues a poison fatal 



Fig. 386. 



Spider's Thread^ 



Spider's Claw. 



