8 SCOHP1ONES. 



the inner series. An outer series similarly results from the enlarge- 

 ment of one or two of the posterior teeth of the median rows. 



The four legs are practically alike in structure ^ and act as loco- 

 motor organs. The coxae of both 1st and 2nd pairs are furnished 

 with a fortvardly-directed maxillary process, which underlies the 

 area immediately below the mouth. The coxae of the 2nd pair 



coxa ; b, trochanter ; c, femur ; 

 tarsus; h, claw-lobe; i, superior 



Fig. 4. A. Diagram of Scorpion's leg. 



d, patella ; e, tibia ; /, protarsus ; 



claw ; k, tibial spur ; I, pedal spur. 

 B. Side view of posterior tarsus of Palamiueus swammerdami. in, lateral lobe 



overlapping base of claw (ri). 



B. 



Fig. 5. A. Lower side of tarsus of Hemiscorpius, showing (a) single anterior 

 pedal spur ; and B, of Ch&riltis, showing (b) anterior and (c) posterior 

 pedal spur. 



meet each other in the middle line. The coxae of the 3rd and 4th 

 pairs are welded together ; they do not meet across the middle 

 line of the body, but are separated from each other by the sternum 

 of the cephalothorax, which has the form of a triangular or penta- 

 gonal plate, and anteriorly abuts against the coxae of the legs of 

 the 2nd pair. 



