26 



EXTINCT MONSTERS. 



wood-lice of the present day ; and the record of the rocks tells 

 us plainly that creatures built upon this plan have flourished ever 

 since. We mention this because they are related to the king- 

 crabs of the present day, and therefore to the huge old-fashioned 

 sea-scorpions we are now considering. 



The best-known and largest of these creatures is represented 

 in Fig. i. It has received the name Pterygotus (or wing-eared) 

 from certain fanciful resemblances pointed out by the quarrymen. 



FIG. I. Pterygolus ttttgScut. (After Woodward. 



i. Upper side. 2. Under side. 



It was first discovered, along with others of its kind, by Hugh 

 Miller, at Carmylie in Forfarshire, in a certain part of the Old 

 Red Sandstone (see Table of Strata, Appendix I.) known as the 

 Arbroath paving-stone. The quarrymen, in the course of their 

 work, came upon and dug out large pieces of the fossilised remains 



