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MANUAL OF ZOOLOGY 



SECT, 



lobe which overhangs it in front is the labrum. On each 

 side of the mouth is a three-jointed appendage the chelicera 

 (Fig. 152, chel} which is terminated by a chela. Behind 

 these are the very large pincer-claws, or pedipalpi (ped}, 

 each composed of six podomeres and terminating in power- 

 ful chelae. The basal joint of each pedipalp has a process 



chel 



FIG. 152. Scorpion. Ventral surface of the cephalothorax and prae-abdomen. 

 chel, chelicera; op, operculum; pect, pectines; ped, pedipalpi; stig, stigmata. 



which bites against the corresponding process of the other 

 pedipalp, these processes thus performing the functions of 

 jaws. Following upon the pedipalpi are four pairs of walk- 

 ing legs, each composed of seven podomeres, the last of 

 which is provided with a pair of small curved and pointed 



