WESTWOOD1LLA HYALINA. 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. 

 caecula, 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. 



