498 CLASS ARACHXIDA. 



end of the mobile cla\v of tlie forceps, and the hairs of the 

 body in the form of a sjoatula. 



Phalangium cancroides, Lin. ; Scorpio cancroides, Fab., 

 Roes., Ins., iii. supp. Ixiv. vulgarly, hook scorpion {Scorpion 

 des lirres) 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 {Obisii(>n,Ijea.ch)ha.xe 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 

 clielifer proper. 



The second family of the Trachean 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 caiTV the eggs. 



The Pycnogonides are marine animals, having some analogy 

 with cyami and caprelhe, or with the arachnides of the genus 

 Phahnigi/n/}, to which Linna?us has united them. Tlieir body 

 is generally linear, with the feet very long, with eight or nine 

 articulations, and terminated by two unequal hooks, a]3pearing 

 to form but one, and the smallest of which is clel't. 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, 



