112 GAMMA RIM. 



short and very robust; the fourth joint has the inferior 

 margin considerably produced anteriorly upon the wrist ; 

 the wrist is short, very short upon the inferior margin, 

 and arched upon the upper, forming an imperfect tri- 

 angle ; the hand is not so broad as the wrist, and 

 gradually tapers to the distal extremity ; the palm cor- 

 responds with the inferior margin, and is imperfectly 

 defined ; a short spine marks the limit to which the 

 finger can reach, which corresponds nearly with the en- 

 tire length of the inferior margin. The second pair of 

 legs are long, slender, and membranaceous ; the third 

 joint is as long as the fourth ; the wrist is as long again 

 as the hand ; the hand increases in width towards the 

 distal extremity ; the palm is furred with minute hairs ; 

 and the finger is very minute. The first two pairs of 

 walking legs are tolerably slender, whilst the last three 

 are very short and robust; the second or squamiform 

 joint is of an oval shape, and is inferiorly produced as 

 far as the distal extremity of the third joint, and the 

 posterior margin is slightly crenulated. In Kroyer's 

 figure this is not so represented, the margin being drawn 

 smooth. The three posterior pairs of caudal appendages 

 are short ; the peduncles are stout, and increase in dia- 

 meter posteriorly upon the upper margin ; the branches 

 are short, and free from hairs. The central terminal 

 plate is round, only showing a slight depression at the 

 apex. 



The specimen from which we drew our figure and de- 

 scription was sent to us by Mr. Edward, of Banff, who 

 procured it in that neighbourhood. 



