KING-CRABS 



26l 



many Copepods. Burrowing animals like 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 



4 



FIG. 1 52. Dorsal view of the King-crab, Limulus polyphf.mus, x \. 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 



