TRACHEATA 407 
The chelicerae are very strong, and project in front of the 
head ; the lower limb is moveable, and works vertically against 
the fixed upper half. The pedipalpi are limb-like. The 
anterior pair of legs belong to the head; their basal joint 
serves as a cutting (maxillary) process, at the side of the 
mouth, an arrangement similar to that found in Limulus 
and Scorpio. Like the pedipalpi, they are directed forward, 
and like them may serve as tactile organs. 
The three posterior legs, which are borne by the three 
free thoracic segments, are clawed. Another point in which 
these Arachnids resemble Insects is the presence of a well- 
formed tarsus. The abdomen is composed of nine or ten 
segments. 
The basal joint of the fourth pair of legs bears five curious 
Fic. 234.—Under side of Galeodes arane- 
oides, with legs and palpi truncated. 
a. Coxa. 
e. Basal leg-joints. 
eX. 1st joint of 1st pair of legs. 
J. Labium. 
h. Racket-shaped appendages. 
7. External orifice of genital organs. 
k. Tongue. 
m. Pedipalpi. 
o. Openings of respiratory organs at base 
of 2nd pair of legs. 
p. Ovifices leading to tracheae at fore margin 
of 2nd and 3rd segments of abdomen. 
7. Anus. 
¢. Fixed upper fangs or claws of chelicerae. 
. u. Moveable lower fangs or claws of cheli- 
P P cerae. 
=a) 
racket-shaped processes, pointing backwards, of unknown 
function. 
The tracheae open to the surface by three pairs of 
stigmata; the anterior pair are on the thorax, the other two 
open behind the second and third abdominal segments. 
The stomach is provided with lateral caeca; the anus is 
posterior, and the genital orifice opens on the first segment of 
the abdomen. Paired coxal glands are found in the thorax ; 
they are much coiled, but apparently have no opening to the 
exterior. 
