262 



ARACHNIDA XIPHOSURA 



CHAl'. 



the numerous appendages project. Thus, although when viewed 

 from above a Limulus looks as though it had a solid body 

 shaped something like half a pear, when viewed from below, 

 especially if the appendages be removed, it will be found that the 



n 



FIG. 153. Ventral view of the King-crab, Limulus polyphemus, x t. From Shipley ami 

 MacBride 1, Carapace covering prosoma ; 2, meso- and meta-soina ; 3, telson ; 

 4, chelicera ; H, pedipalp ; 6, 7, 8, 9, 3rd to 6th appendages, ambulatory limbs ; 

 10, genital operculum turned forward to show the genital apertures; 11, 12, 13, 

 14,15, appendages bearing gill-books ; 16, anus; 17, mouth; 18, chilaria. 



body is thin and hollowed, and almost leaf-like, as if most of the 

 edible part of the half-pear had been scooped out. Within the 

 hollow thus formed the appendages lie, and here they move 

 about, seldom . >r never . protruding beyond the edge of the 

 carapace, in fact, all except the pedipalps and ambulatory legs 

 are too short to project beyond this limit. 



