THE KING CRAB 



which the modern air-breathing scorpions and 

 spiders have been developed. 



From amongst all the great variety of extinct 



Fig. 210. — Dorsal view of the King-Crab (Limulus polyphemus 

 Linnfeus), one-fourth the size of natvire. (Cut lent by 

 Messrs. Macmillan from Parker and Haswell, Text-book of 

 Zoology. ) 



invertebrate animals, I select for our last illus- 

 trations and descriptions a few of the beautiful 

 stone-lilies or Pentacrini, or Encrinites as they 



283 



