418 ZOOLOGY 
in eating, and the third leg also sends in a process towards the 
mouth, recalling the condition of things in Scorpio. 
The abdomen consists of six to ten segments; its sterna 
project forward, and, as the anterior one bears the genital pore, 
this orifice is situated at the level of the third pair of legs. 
Just behind this are the two stigmata which open into the 
tracheae. These are at first wide, but they soon narrow and 
subdivide into small branches ; the whole system is strengthened 
by a spiral thickening of chitin. 
The oesophagus is wider than in spiders, and the Phalangids 
eat solid food; the stomach is provided with a number of 
caeca, and there are a pair of Malpighian tubules; the anus is 
terminal. The coxal glands are well developed; they consist 
of a coiled tube, which it is suggested has been mistaken for 
the Malpighian tubules; this opens at one end into a ventrally 
placed sac, and at the other to the exterior at the base of the 
third pair of legs. 
The heart is a long dorsal vessel with three chambers and 
three pairs of ostia. The nervous system consists of a bilobed 
supra-oesophageal ganglion and a concentrated ventral mass. 
There are no spinning-glands. 
The Phalangids have no external indications of sex. Both 
Fic. 239.—Phalangium cornutwm, Linn. (Harvestman). Profile, with legs and 
palpi truncated. 
a. Eye eminence. d. Sheath of penis protruded. 
6, Chelicerae. e. Penis. 
c. Portion of mouth apparatus. J. Glans. 
