THE ARTHROGASTRA. 



321 



which correspond with the third, fourth, fifth, and sixth, of 

 the free ter^a. Each of these bears a pair of oblique slits, 



Fig. 8i.— Scorpio afer.—A, teraal, and 5, sternal, view of tlie body ; At. chelicerae ; 

 IV', pedipalpi ; v'. vi', pofsterior pair oi' cephalic appendaL'ee ; vn', viii', anterior 

 tlioracic limbs; Pf, pectines ; St, stigma; Ctk, cephalo-thorax. (After Milne- 

 Edwards and Duges.i) 



which are the openings of the respirator}^ organs (Fig. 85, e). 

 The sterna of the first and second free somites (ix, x) are very 

 small ; that of the first carries the valves which cover the 

 genital aperture ; that of the second bears a pair of very 

 curious appendages, somewhat like combs, which are termed 

 the pectines. The nervous trunks which enter the pectines 

 are distributed to the numerous papilLTi which cover them, 

 and are probably tactile in function. Thus there are twelve 

 somites behind the eye-bearing shield, and none of these are 

 provided with appendages, unless the pectines be such. 



The truncated anterior extremity of the body, beneath the 



» " Eegne Animal," Illusti-ated Edition. 



