6 HYPERIIDJJ. 



peduncle ; the remainder being very short, the basal ones 

 being shorter than broad. The inferior pair have the last 

 joint of the peduncle nearly as wide at the distal extre- 

 mity as at the base, and terminating inferiorly in a strong 

 tooth. The flagellum is suddenly narrower, and after 

 the first articulus consists of several short articuli. The 

 mandibles are broad and short, not terminating in teeth, 

 or a sharp cutting blade. The molar denticle consists of 

 a flat plate, furnished with a thick down of hair. The 

 appendage has three joints ; the first extremely short, the 

 others being equal, and the last terminating in a sharp 

 point ; the whole being remarkably free from hairs. The 

 first two pairs of legs are very small and sub-equal ; the 

 first pair have the metacarpal joint and wrist inferiorly 

 produced, and tipped with several stiff" spines. The hand 

 is narrow and tapering ; the inferior margin serrated, the 

 serrature consisting of a series of rather long teeth, asso- 

 ciated in groups of three, the longest in each group being 

 the most anterior. The finger is slightly curved, and 

 armed upon the inner margin with a serrature similar in 

 character, but less regular in feature, to that of the pre- 

 ceding joint. The second pair of legs much resemble 

 the first, but have the wrist rather more infero-anteriorly 

 produced. The hand is a little longer, and has the 

 armature upon the inferior margin, as well as that of the 

 finger, less distinctly marked. The other legs are nearly 

 of equal length. The caudal appendages vary in length ; 

 the penultimate pair being considerably the shortest, 

 while the last are the broadest and longest, and have the 

 inner ramus, as well as the inner margin of the outer 

 ramus, freely serrated. The middle tail-piece is ovately 

 lanceolate. 



The antennas in our British specimens are slightly 

 longer than represented in Kroyer's figure of the type. 



