pair of appendages in Lithohius. 179 



appendage. The basal joints of the two sides are more completely 

 fused than are the poison-claws, and in the position where the 

 latter bear six small processes or teeth on each side, the extra 

 appendages bear on each side two larger teeth, which have the 

 appearance of being jointed on to the base of the appendage, and 

 are not mere processes of it as they are in the normal pair. 



The mandibles and both pairs of maxillae appeared to be 

 perfectly normal, and behind the normal pair of poison-claws 

 there were as usual fifteen pairs of walking legs. 



