88 CYAMID®. 
affixed upon a common, elongated basal piece, inserted 
betwen the basal joints of the first pair, and the mouth 
is closed below by a transverse piece (fig. g), emarginate 
in its fore margin, which Savigny terms a “ lévre auxiliare 
sans lobes,” but which we regard as the ventral surface of 
the segment that carries the pair of foot-jaws (which are 
attached at its sides); these are five-jointed, the fourth 
being the largest. 
The first segment of the body is small, with the front 
part rounded on its upper edge, its lower being dilated 
in the middle into an angle. 
The second segment is much longer than either of 
the two following, its fore margin is nearly straight, 
having a very minute rounded prominence towards each 
of its lateral anterior angles; it is deeply channeled 
across its centre. The legs attached to this segment are 
very large and broad, the second joint strongly angulated 
on its upper edge, the small third joint rounded and 
prominent on its lower edge, and the fourth joint with a 
moderate semi-lunate impression on its lower edge. The 
third and fourth segments of the body are very short, 
the fourth having its sides produced at the posterior 
lateral angles, whilst its hinder margin is emarginate on 
each side. The fifth, sixth, and seventh segments are 
each as long as the second, but gradually narrowed, their 
fore and hind margins are sinuated, leaving spaces be- 
tween the joints. The legs attached to these three seg- 
ments are nearly uniform in size, large and broad, with 
the fourth joint somewhat conical, having the upper edge 
rounded ; the terminal joint in all the legs is very acute, 
curved, and as long as the preceding joint, thus giving 
the animal strong powers of prehension. The tail is 
very minute and rudimental. The full-grown female 
has the body wider than the male, and has the third and 
