32 
HISTORY OF BRITISH CRUSTACEA. 
miens , where it has taken its station during the night, the 
season of its chief activity, as of most other Crustacea. It 
interested me much to see it climb ; seizing the twigs above 
it by stretching out its long arms alternately, it dragged up 
its body from branch to branch, mounting to the top of the 
plant deliberately, but with ease. While watching it I was 
strongly reminded of the Orang-otan at the Zoological Gar- 
dens ; the manner in which each of these very dissimilar 
animals performed the same feat was so closely alike, as to 
create an agreeable feeling of surprise. This circumstance 
led me to think of another ; the resemblance was not only 
in habit, but in conformation also, viz. in the great length 
of arm. This is obviously an adaptation for climbing in the 
Quadrumane as well as the Crustacean ; and a few examples 
occurred to my remembrance in which a similar structure 
is associated with the like habit. All the Monkey tribe, 
for instance, and the Sloths of South America, which are 
almost exclusively arboreal, have the anterior limbs exces- 
sively long. Many of the Longicorns among Beetles are 
remarkable for their developed arms, and these are essen- 
tially tree insects. Again, among the Spiders, the per- 
pendicular web-makers, as Epeira, Tetragnatha , etc., which 
run to and fro on the tracery of their slender lines, like sea- 
