58 
“TERRA NOVA’’ EXPEDITION. 
Proboscis about two-thirds of length of trunk, widest about the middle, where its 
width is less than half its length. 
Abdomen horizontal, little shorter than proboscis, reaching beyond middle of 
second coxa of last legs, slightly clavate and bluntly pointed. 
Chelopliores extending to, or a little beyond, middle of proboscis. Palps with 
second and fourth segments equal, sixth and seventh produced vent-rally, terminal 
segment little longer than preceding. 
First coxae each with two conical tubercles of which the posterior is the larger. 
Femur and first and second tibiae subequal or slightly longer successively; femur from 
about three times as long as deep in the female to more than six times in the male. 
Auxiliary claws one-third as long as main claw. 
Sexual differences. —Apart from the usual differences in the diameter of the 
femora, the males apparently tend to have the trunk more elongated and the lateral 
processes more widely separated than in the females; they have also the tubercles 
on the lateral processes more prominent and those of the first coxae forming spurs 
which may be as long as the width of the segment. 
Variation. —The specimens examined differ among themselves in the relative 
length of the body, the degree of separation of the lateral processes, and the 
length of the legs. Two extreme types are represented in Figs. 13 and 14, but 
many specimens are intermediate. In the more elongated forms the spiniform tubercles 
on the lateral processes and first coxae are longer, as is also the conical apex of the 
ocular tubercle. 
Two specimens differ from the typical form in the segmentation of the body. In 
one, there is a very distinct articulation between the last two somites ; in the other, 
the only articulation is between the first two. 
Measurements, in mm. —The measurements here given are taken from two fairly 
o J 
representative specimens :— 
6 9 
Length of proboscis 
Greatest width of proboscis . 
Length of trunk 
Width across second lateral processes 
Length of abdomen 
Third right leg— 
Coxas ..... 
Femur ..... 
First tibia .... 
Second tibia .... 
Tarsus and propodus 
Main claw .... 
Auxiliaries .... 
1 
2 
1 
04 
5 
44 
1 
72 
1 
6 
1 
6 
1 
52 
1 
04 
92 
1 
52 
1 
48 
1 
8 
1 
84 
1 
88 
•) 
0 
9 
Li 
0 
1 
92 
1 
08 
1 
o 
50 
52 
16 
LG 
