WESTWOOD ILLA HYALIN A. 
159 
or six articuli, is not longer than the last joint of the 
peduncle. The arms are subequal, the first pair having 
the wrist inferiorly produced, and the hand long-ovate ; 
while the second have the hand furnished, upon the 
anterior distal extremity, with a brush of hair ; both 
arms, in fact, closely assimilate to those of W. 
cwcula , whilst the rest of the animal approximates so 
nearly to that species, that we should have described it 
as being but sexually different, had there not been a 
very decided alteration in the microscopic appearance of 
the skin. Like the previous species, most of the body 
of the animal is covered by a fine fur, which, we think, 
is somewhat of a finer character than that of W. ccecula , 
and deeper in the structure may be observed the arrange- 
ment of the cells on a similar plan. Each cell is marked 
by a double row of elongated dots, and regularly ap- 
proaches the adjoining cell, like chain-armour; but the 
black spot which occupies the centre of each cell, and is 
so conspicuous in the previous species, is not visible in 
this, which therefore becomes still more transparent and 
clear. In fact, the species, whilst living, is scarcely per- 
ceptible, but for its great purple eye. 
We procured this species from the refuse of trawlers, 
who had been fishing near the Eddystone Lighthouse. 
