262 ARACHNIDA—XIPHOSURA CHAP. 
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 
Fic. 153.—Ventral 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, chelicera; 5, pedipalp ; 6, 7, 8,9, 38rd 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. 
