THE SCOTTISH SILUEIAN SCORPION. 



299 



upon the accuracy of the attempted restoration of these 

 structures. 



7 ^1- 



Fig. 2. — a. Fourth leg of Limulus moluccanus, b. Fourth leg of a 

 I'ecent scorpion (Buthus australis). c. Third leg of Silurian scorpion, 

 Palseophonus uuncius, after Tiiorell. 



1 — 7. Segments, s. Suture between fourth and Gfth segments of the leg 

 in Limulus. sp. Spurs and lobate sclerites. ? «/). Processes possibly re- 

 presenting the point of attachment of spurs in Palffiophonus. cl. Claws 

 in the scorpion, and pair of sclerites forming a nipper in Limulus. 



In existing scorpions the basal segiuents (cox£e) of the 

 legs of the first and second pairs are furnished with a for- 



