338 ZOOLOGY. 
three pairs of feet, and in this and other respects resembles 
Podura. Asecond form, Hurypauropus, of Ryder, has six 
segments,. with nine pairs of feet wholly 
concealed from above by the expanded seg- 
= ments. The antenne end in a terminal 
= globular hyaline body with a long pedicel, 
as in Pauropus, and the mouth-parts are 
as in that genus. ZH. spinosus Ryder is 
reddish brown, and one mm. in length. 
Order 3. Chilopoda.—This group is rep- 
resented by the centipede and Lithodius, 
in which the body is flattened, the sternal 
region being well developed. In Geophilus 
(Fig. 303, Gi: bipuncticeps Wood) and allies 
there are from thirty to two hundred seg- 
ments. Our most common form is Litho- 
bius Americanus Newport, found under 
logs, etc. The centipede (Scolopendra 
heros Girard) is very poisonous, the poison- 
Dba Machen sac being lodged in the two large fangs or 
larged. Fig. 3% en first pair of legs. In Cermatia the body is 
and antenne and first short, with compound eyes and remarkably 
long slender legs. C. forceps Rafinesque, of 
the Middle and Southern States, is said to be poisonous; it 
preys upon spiders. (Wood’s Myriopoda of North America, 
1865.) 
Ciass V.—ARACHNIDA (Spiders, etc.). 
Characters of Arachnida.—The bodies of spiders and scor- 
pions, etc., are divided into two 
regions, a head-thorax and abdomen, 
the head being closely united with 
the thorax. There are no antenne, 
only a pair of mandibles and a pair 
of maxille, with four pairs of legs. 
There are never any compound eyes. 
The young are usually like the adult, 
except in the mites, in which there Fig. 805.—Head of Paur 
is a slight metamorphosis. In all Bee See 
Arachnida there is a liver, this organ not being present in 
the winged insects. 
