88 GAMMARIDJ!. 



the wrist gradually tapers to the distal extremity, where 

 it supports a short straight finger. The appendage is 

 but scantily clothed with hairs. The second pair of legs 

 are long and slender, having the wrist twice as long as 

 the hand, with the inferior margin convex and the su- 

 perior straight, the widest part being near the middle of 

 the joint ; the hand gradually but slightly increases in 

 diameter to the extremity, where the inferior angle is 

 produced in advance of the palm, and thus gives the 

 part a nearer approximation to a chelate organ than is 

 common in this order of Crustacea. The upper margin 

 of the hand to the apex is thickly furnished with long 

 double-branched hairs, the lower margin is studded with 

 straight parallel hairs, and the inferior angle covered with 

 short thick spines or obtuse hairs, very minute. The fin- 

 ger articulates near the centre of the extremity of the 

 hand, and is short, sharp-pointed, and curved. The 

 walking legs are subequal, and do not materially differ 

 from those of other species of this genus. The two pen- 

 ultimate pairs of caudal appendages are styliform, and 

 have the branches subequal in length, the upper margins 

 being furnished with a few short hairs. The last pair 

 reaches much further posteriorly than the two preceding, 

 but the basal joint is very short, while the branches are 

 long, subequal, and thickly furnished with long plumose 

 cilia. The central tail-piece exhibits no peculiar character. 

 The colour of the animal, when fresh taken, was 

 bright orange, mottled with red spots along the sides of 

 the body, just above the legs. The specimen from which 

 our drawing is taken was dredged by us in Plymouth 

 Sound, and described under the name of Lysianassa 

 chausica, being under the impression that it agreed with 

 Edwards' description of Alibrotus chausicus ; but through 

 the kindness of the authorities at the British Museum, 



