AMYMONE. 29 



First segment of the body produced ventrally into 

 a large triangular or broadly falciform promontory ; 

 last segment of the thorax and first of the abdomen 

 coalescent, produced in the female into a doubly- 

 hooked projection, and in the male into a long trian- 

 gular process, which nearly meets that of the 

 cephalothorax (represented by the dotted line in 

 fig. 1) ; abdominal segments and tail setae very short. 

 Anterior antennae in the female 8-jointed, slender, and 

 tapering; nearly as long as the first body- segment ; 

 joints decreasing in length from the first to the sixth, 

 last three nearly equal; in the male the first, second, 

 and fourth joints are long (fig. 2) and nearly equal, 

 the third, fifth, and eighth very short ; a hinge between 

 the sixth and seventh joints ; in both sexes the outer 

 margin of the limb is clothed with short hairs. Poste- 

 rior antennae (fig. 3) 3-jointed, long and slender, the 

 first joint giving attachment to a small 1- jointed, 

 secondary branch, which bears several apical setae ; the 

 last joint is clawed at the apex, and has likewise three 

 or four moderately long setae. Mandible (fig. 4) 

 slender; palp 2-jointed. Maxilla (fig. 5) slender; 

 palp 2-jointed, first joint short, second long, slender, 

 and curved, each joint bearing three or four strong, 

 curved, apical setae. First foot-jaw 3-jointed (fig. 6), 

 last joint very slender, and, like the previous one, 

 giving origin to a setiferous process. Second foot- 

 jaw (fig. 7) very long and strong, forming a powerful, 

 chelate, prehensile limb, the hand elongated, ovate, 

 bearing a comb-like series of teeth on the inner 

 margin ; claw long and curved. The four pairs of 



