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. — Pterygoius anglicus. (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 
