22 EEV. T. R. E. STEBBLNG ON THE 



Month-organs as in Urothoe elegans. The palp of the first maxillw consists of two 

 equal joints, and has three setee on the apex. 



First gnatlwpods. The side-plates with a row of six setae on the truncate distal margin. 

 The limb nearly as in Urothoe elegans, the spine-row at the apex of the wrist consisting 

 of only three or four spines. 



Second gnathoj)ods nearly as in Urothoe elegans. 



First and second perceopods scarcely to be distinguished from those of Urothoe elegans, 

 except that the inner margin of the finger, which in that species has very few nodules, 

 is here closely serrate, of the series of projecting points only the large one nearest the 

 tip of the finger being blunt enough to deserve the name of a nodule. 



Third perceopods distinguished from those of Urothoe elegans by the much rounded 

 lower hind corner of the first joint, fewer plumose setse on the third and fourth joints, 

 and by the close serration of the distal half of the slender tapering finger. 



Fourth perceopods. The front margin of the first joint has some spinules at four points 

 of the upper part, and at intervals on the lower part four long plumose setse ; the third 

 joint is longer than the fourth, the plumose setae on the hind margin missing, but not 

 originally more than three or, at most, four in number ; the finger slender, closely 

 serrate for two-thirds of its length. 



Fifth perceopods nearly as in the female of Urothoe elegans, but here the third and 

 fifth joints are nearly equal in length, the fourth joint being decidedly longer than 

 either, with spines at four points of the front and at three of the hind margin. 



Pleopods. The peduncles short ; the cleft spines two or three ; the inner ramus with 

 ten or eleven joints, the outer with thirteen to fifteen. 



Uropods. Peduncles of the first pair a little longer than the straight slender rami, 

 the outer ramus with one spinule just above the middle, the inner equal in length, 

 smooth ; the peduncle of the second pair not longer than the rami, which are slender, 

 straight, subequal to one another, but shorter thau those of the first pair; they are 

 smooth, or possibly there is a spinule on the outer ramus; the peduncles of the third 

 pair are shorter than the rami ; the inner ramus is considerably shorter than the outer, 

 with a single seta near the extremity of its outer margin, five or six plumose setae on 

 the inner margin ; the outer ramus has a spinule and seta at three points on the lower 

 lialf of each margin ; the second joint is a third the length of the first. 



Telson cleft nearly to the base so as to form two halves almost oval, but straight at 

 the base, and with the adjoining margins slightly compressed along the upper part ; 

 below the centre of each outer margin there are two cilia, and from an incision in 

 each rounded and rather narrow apex projects a moderately long spine, with a minute 

 cilium adjoining on the outer side. 



Lengtli about one fifth of an inch or less. 



Locality. The Shetland Isles, taken by the Eev. A. M. Norman in 1867. 



