172 TWELFTH ANNUAL REPORT. 



third, aud obliqutly truncate. Inner ramus of third pair of legs in 

 male is three-jointed, [the outer two-jointed,]* chelate. The finger 

 is ov^ ate, truncate, terminating in two long plumose hairs. The 

 dactyl is linear, curved at base, aud twice as long as finger. The 

 inner ramus of the fourth pair of legs is about half as long as 

 outer, two-jointed, basal joint short, terminal joint about as long 

 as middle joint of outer ramus. The Jifth pair of legs is best de- 

 veloped in the female. In the male the length is not over one- 

 third the width. The basal portion bears three plumose hairs on 

 its very broadly rounded anterior margin, of which the innermost 

 is longest. The outer plate is nearly orbicular and bears five 

 spines on its terminal margin, of which the second from the inter- 

 nal angle is the longest. Genital plates, found in male at posterior 

 border of first abdominal segment, beneath, are short, slightly ex- 

 panded internally, with internal angles rounded, and externally 

 bear three sub-equal bristles, jointed at base, the inner largest and 

 strongest and semi-plumose. The antennce of the female are eight- 

 jointed, extending backward to the first free segment. The basal 

 joint of the Jifth pair of legs is sub-elliptical in outline, with the 

 basal half produced externally into a broad, triangular process 

 which bears the second joint on its posterior margin. The free end 

 of the basal joint bears six large plumose bristles of which the in- 

 ner is longest. The greatest width of the joint is nearly equal to 

 its greatest length. The second or outer joint is ovate, sub-trun- 

 cate, spined on each margin, and bears four plumose bristles at tip 

 and one at the middle of its outer margin. Its length is about 

 twice its breadth." 



Sp. 9. Canthocaiaptus hibernicus, Brady. 



A small species differing from all others save the next in having 

 a three-jointed inner ramus of the fourth foot. 



"Anterior antennae of the female slender, 8-jointed, about as 

 long as the first body segment, and much like that of C. minutus. 

 Inner branch of the second antenna very small, 1-jointed. Poster- 

 ior foot-jaw having a broad hand armed with a long apical claw. 

 Inner branch of the first pair of feet scarcely twice as long as 

 the outer; first joint longer than the entire outer branch, and near- 

 ly twice as long as the united second and third joints, both of 

 which are extremely small. Inner branches of the second, third 

 and fourth pairs shorter than the outer, and 3-jointed, the first joint 



* Evidently a misprint, for It la the Inner ramus which Is chelate. 



