154 
The second, third, and fourth segments of the pereion are all 
about equal in length, being about three times as long as the first 
in the centre. They are of the same length throughout from side 
to side. 1 he inferior margins are slightly concave in the centre 
for the reception of the bad of the legs (epimera) and have the 
anterior angle slightly produced and tipped with sets*} while the 
posterior angle is regularly rounded. (See Plate xxiii., tig. 1, and 
also Plate xxv., tig. 4). 
The fifth, sixth and seventh segments are similar to one another, 
the fifth being somewhat shorter than the fourth, and the 
sixth and seventh each shorter than the preceding segment. The 
epimera extend along almost the whole of the inferior margins 
and tit into rather deep triangular ernarginations ; both the 
anterior and posterior angles of the margins are tipped with setae 
(see Plate xxv., fig. 5). 
Epimera , — The first to fourth epimera inclusive are all similar 
in form, and consist of two lobes separated by a distinct cleft 
reaching upwards from the inferior margin more than half way 
to the upper margin. The epimeron of the first segment is rather 
deeper than those of the other three, in the first and second the 
two lobes of the epimera are of about equal size, in the third and 
fourth the anterior lobe is larger than the posterior. The margins 
of the epimera are free from seta?. (Plate xxv., fig. 4.) 
The epimera of the fifth, sixth, and seventh segments are all 
similar and are triangular in shape fitting into a triangular emar- 
gination in the inferior margins of the segments. The posterior 
angle is produced a little and is tipped with three or four setae, 
while the anterior angle is somewhat rounded and bears no setae. 
There are usually two or three short seta? on the surface of the 
epimera. (Plate xxv., fig. 5.) 
Pleon.— The first segment of the pleon is nearly as long as the 
seventh segment of the pereion in the centre of the dorsal surface, 
but gradually narrows somewhat interiorly. It extends downwards 
slightly beyond the epimeron of the seventh segment of pereion and 
has the lower margin regularly rounded. The second, third, fourth, 
and fifth segments are similar, slightly longer dorsally and not 
narrowing interiorly and they are produced downwards consider- 
ably further than the first segment. The sides of the segments 
(pleura) are thus fully as well developed as in any of the Amphi- 
poda, and form, as in the Amphipoda, a lateral protection for the 
pleopoda. The body part proper in the fifth segment is separated 
from the pleuron by a slight depression. The sixth segment and 
the telson appear completely coalesced, forming a tail piece regu- 
larly convex above, curving posteriorly as well as from side to 
side ; posteriorly it ends in a small narrow projection tipped with 
stiff seta3. From the upper corner of the articulation of the 
uropoda with the segment a short ridge bordered with setae ex- 
