306 
HISTORY OF BRITISH CRUSTACEA. 
the antennae assumed this position, for it could He seen 
making slow progress in the water with the antennae at 
right angles to the body. The antennae are surmounted 
by a tuft of bristle-like spines pointing backwards. The 
last segment of the body terminates also in a number of 
spines or setae, which, in many individuals, are of a beau- 
tiful reddish and pearly colour, and by means of which a 
person is enabled to detect them in the water. They are 
always on the alert to elude and escape from their pursuer. 
When the w r ater is but slightly agitated they dive from the 
surface, and, in a few minutes, when it becomes. still, they 
can be seen ascending slowly, but rarely using the antennae. 
I could only obtain specimens by including them in a large 
quantity of water taken up suddenly, from which they could 
be separated subsequently by straining through a calico bag. 
A bucketfull (two gallons) of water often produced twenty 
to thirty individuals, and sometimes twice that number. 
They never survived a single night, even though kept in 
their native element in a vessel. From their constant dart- 
ing from side to side of the vessel, perhaps it is a safe in- 
ference that the fear of danger in their new situation may 
be one of the chief causes of the early extinction of life.”* 
* Dr. Sutherland, ‘Voyage to Baffin’s Bay/ vol. i. pp. 71, 72. 
