AMPH1PODA. 
159 
few instances there are four eyes, and in one genus only a 
single pair of antennae ; the mandibles are furnished with a 
palpus. There are branchial vesicles under the thorax ; 
the first five pairs of abdominal limbs differ in form, and 
are used in locomotion. The females carry their eggs 
beneath the thorax, frequently in flabelliform appendages 
fixed to the base of their legs. 
The species are all small ; Professor Edwards knew not 
any that was longer than eighteen lines, but they make up 
in numbers for any deficiency in size. They are found in 
every sea. Some of them abound in the Arctic regions, 
and as an instance of their voracity and abundance, Dr. 
Sutherland^ mentions that in Davis's Straits he has seen an 
entire seal reduced to a perfect skeleton in less than two 
days by the attacks of the Garnmarus arcticus ; he adds, 
“ I observed a dead seal in the water, which an Esquimaux 
had been towing for three hours. A great number of these 
active little creatures were in the water around it, and they 
could be seen going in the direction of one of the wounds 
in the skin, by which they entered a large chamber which 
they had hollowed out beneath in the flesh and blubber, of 
which they are very fond." The arrangement of Amphi- 
* Voyage in Baffin’s Bay and Barrow’s Straits, i. 142. 
