262 



ARACHNIDA XIPHOSURA 



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 



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12 



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

 MacBride. 1, Carapace covering prosoma ; 2, meso- and meta-sonui ; 3, telsou ; 

 4, chelicera ; 5, 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 or 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. 



