306 HISTORY OF BRITISH CRUSTACEA. 



the antennae assumed this position, for it could be 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 water 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 ofaanger 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. 



