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CLASS ARACHNIDA. 
end of the mobile claw of the forceps, and the hairs of the 
body in the form of a spatula. 
Phalangium cancrdides , Lin.; Scorpio carter oides, Fab., 
Rees., Ins., iii. supp. lxiv. vulgarly, book scorpion (Scorpion 
des livres) is found in herbals, old books, &c., where it lives 
on the little insects which destroy them. 
Another, Scorpio cimicoides , Fab., Herm., Mem., Apter. 
vii. 9. lives under the barks of trees, stones, &c. 
Others (Obisium, Leach) have the thorax without division, 
the forceps without stylet, the hairs of the body in the form of 
threads ; but the number of the eyes furnish us with a more 
important character. It is four in obisium, and two in 
chelifer proper. 
The second family of the Tracijean Arachnides, 
that of 
Pycnogonides, 
Has the trunk composed of four segments, occupying almost 
all the length of the body, terminated at each extremity by a 
tubular articulation, the anterior of which, larger, sometimes 
simple, sometimes accompanied with forceps and palpi, or 
with a single species of these organs, constitutes the mouth. 
The two sexes have eight feet proper for running ; but the 
females have, besides, two false feet, situated near the two 
anterior, and serving only to carry the eggs. 
The Pycnogonides are marine animals, having some analogy 
with cyami and caprellce, or with the arachnides of the genus 
Phalangium , to which Linnaeus has united them. Their body 
is generally linear, with the feet very long, with eight or nine 
articulations, and terminated by two unequal hooks, appearing 
to form but one, and the smallest of which is cleft. The first 
articulation of the body, and which holds the place of head 
and mouth, forms an advanced tube, almost cylindrical, or in 
a truncated cone, having at its extremity a triangular aperture, 
