26 Mr. Lubbock on 



In the fourth pair both branches have three segments. The 

 hairs on tlie outer margin are short, thick and spinous. On the 

 inner branch eacli of the two basal segments has one hair at the 

 apex. The apical segment has two hairs at tlie margin, and two 

 at the apex. The apical segment has four hairs, and a large spine 

 at the apex. 



Length '04. 



Fifth pair of legs. Length "055. 



Length of cephalothorax '095. 



,, abdomen '040. 



,, Ant. antennae 'IIO. 



Collected in N. L. 31° 50', L. W. 1S° 30'. 



PI. VIL figs. 1 to 5. PI. IV. fig. 4. 



U?icUna pulckra, n. s. 



Maris. — Frons triangulata. Cephalothorax 4? articulatus pos- 

 tice obtusus. Antennae anticae corpore parce breviores, arti- 

 cidis ultimis tribus subaequis, setis brevibus, setd articuli tertii 

 longa, recta, setis apicalibus brevibus, una tamen sublonga, 

 postici penultima, et antepenultimd perbrevibus. Maxilli- 

 pedes parvi, articulis quinque ultimis exiguis, ut in Euchceld. 

 Abdomen 4-articulatum. Styli caudales parvi. 

 In general form this species closely resembles U. Heleiiee, from 

 which, however, it differs in the form of most of the appendages. 



The anterior antennae have the three terminal segments nearly 

 equal ; the middle one rather the smaller of the three. The fourth 

 segment was longer than the two succeeding in the right antennae 

 of the single specimen at my disposal ; but in that of the other 

 side it appeared as if it was in the process of division into two. 



The accessory branch of the second pair of antennae is half again 

 as long as the organ itself, and appears to have only four hairs 

 attached to the small intermediate segments. At the apex of the 

 organ itself the one tuft consists of six long subequal hairs, the 

 other of five long hairs and two short ones. 



The two basal segments of the maxillipeds are long and thin, 

 and the five terminal segments are small. Length •031. 



The length of the first pair of natatory legs is -023. The outer 

 branch has two segments. There is a hair at the apex of the 

 basal, and two on the margin, and two at the apex of the apical, 

 besides the spine. The inner branch has two hairs at the margin, 

 and two at the apex. 



The length of the fourth pair is "035. The margins are less 

 entire, the hairs of the outer margin shorter and thicker, and the 



