x KING-CRABS 261 
many Copepods. Burrowing animals lke Limulus are usually 
free from these messmates. King-crabs have a self-respecting, 
well-groomed appearance. On the rounded dorsal surface the 
chitinous covering is produced into a certain number of spines 
Fic. 152.—Dorsal view of the King-crab, Limulus polyphemus, x 4. From Shipley and 
MacBride. 1, Carapace covering prosoma; 2, meso- and meta-soma ; 3, telson ; 
4, median eye ; 5, lateral eye. 
arranged in a median and two lateral rows. The anterior median 
spine overhangs the median eyes, and the anterior lateral spine 
on each side overshadows the large lateral eyes. 
The vaulted carapace is turned in on the under side, where 
there is a flat rim which widens anteriorly, and on the inner 
edge this rim borders a sunken area, into the concavity of which 
