96 ZOOLOGY. 



ing the food, which the horseshoe obtains by burrowing in the mud 

 or sand. Tlic moulli is situated between tlie second pair; the first 

 pair of legs are smaller than the others. All end in two simple 



FiG- 120. — Actual section thronph the head of Limulus. showing the second pair 

 of appendages and tlieir relations to the shell or carapace, ht, heart;, liv, 

 liver; end, appendage homologous with the endopodite of Decapoda. 



Fig, 121.— Section throufch the abdomen of IJmnlus. c, carapace; ht, heart; int^ 

 intestine; »((/, ^'anglia (lettering Ijeing the same ns in Fig. VZ'i)\ en, axial* 

 jointed endopMilite; (jx, exltal or respiratory portion bearing the gill-la'melte; 

 the oiUer di\ision U'x) homologous with tlie exoijodal portion of tlie Phyllo- 

 pod and Phyllucaridan leg. 



I Jaws (Fij;. 120), except tlte si.xlh pair, which are armed wUh several 

 spatulate apiieiulages serving to prop the creatuie as it Ijurrows into 

 the mud. Appended to the abduiuen are si.x pairs of broad swim- 

 ming feet (Fig. 131, e.e), of which all but the first pair bear on th« 



