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MANUAL OF ZOOLOGY 



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 prs-abdomen. 

 chel, chelicerae; op, operculum; pert, pectines; ped, pedipalpi; sttg, 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 



