o/ 
6 HYPERIIDA. 
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, nof 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 antenne in our British specimens are slightly 
longer than represented in Kroyer’s figure of the type. 
