37 



Ameira gracile, w. sp. PI. II., figs. 1 — 11. 



Description of the species. — Female. Length • 5 millim. 

 (J(j^th of an inch). Body elongate and slender, rostrum 

 small and inconspicuous. Antennules long and very 

 slender, seven-jointed; second and fifth joints longer than 

 any of the others, fourth joint very short, the second, 

 third and fourth joints have each a tuft of long set® on 

 the upper distal margins, the following formula shows 

 the proportional lengths of the joints : — 

 9 . 18 . 10 . 4 . 13 ■ 8 . 9 

 12 3 4 5 6 7 



Antennae slender, three-jointed, secondary branch small, 

 tw^o-jointed, the second joint very small. Mandibles 

 elongate narrow, apex obliquely truncate and armed with 

 a number of teeth, mandible palp with a distinct basal 

 part, narrow at the base but somewhat dilated towards 

 the apex to which is attached a one-jointed elongate 

 narrow branch. Posterior foot-jaws moderately robust 

 and armed with a strong terminal claw, lower margin of the 

 second joint furnished with a row of fine cilia. First pair 

 of swimming feet elongate and slender, basal joint of the 

 inner branches nearly as long as the entire outer branch, 

 second joint about one-fourth the length of the basal 

 joint and fully half the length of the third joint. Outer 

 branches of the second, third and fourth pairs elongate 

 three-jointed, inner branches also three-jointed but shorter 

 than the outer branches. Fifth pair of feet foliaceous, 

 the inner branch produced into a subtriangular lobe 

 which reaches to about the middle of the outer branch and 

 furnished at the apex with a stout setiform spine and a 

 small seta, outer branch oblong ovate in shape, the 

 greatest breadth being very nearly half the length, 

 furnished with three setoe on the outer margin, one on 

 the apex and one on the inner distal margin, both the 



