272 '• THETIS " SCIENTIFIC RESULTS. 



verse groove extending to the insertion of the uropods. First 

 epimeral process of the peraeon large, with the anterior border 

 obliquely curved and reflexed ; the posterior border is acute, 

 and directed backwards ; the second to fourth are about twice 

 as deep as long, and obtusely pointed ; the fifth, sixth and 

 seventh are broadly rounded. Side plates of the pleon large, 

 with the anterior border rounded. Eyes oblong, the pigmented 

 area is surrounded by a slightly raised granular border. First 

 antenna with the basal joint stout, its anterior surface strongly 

 granulose, and sparsely setose ; second joint as long as the width 

 of the first, a few granules are presented on its anterior surface; 

 third joint slender, one-fourth longer than the second. The 

 flagelium is equal to the peduncle in length, and consists of 

 eleven articulations, the first joint is the longest, the fourth, fifth 

 and sixth are equal, and nearly one-third longer than the second, 

 third, eighth, or ninth. The second antennae have the first 

 and second joints equal ; the third is a little longer than the 

 first, the fourth is as long as the two preceding combined. 

 Flagelium longer than the peduncle, consisting of thirteen joints, 

 the second is shorter than first or third, the fourth is shorter than 

 any preceding or following. All the joints have a superior 

 transverse row of setse on the distal margin ; the second and 

 third joints have, in addition, a second row of sette situated in 

 the middle of the external surface. Mandibles stout, angularly 

 bent near the summit ; cutting edge unidentate, obtusely rounded, 

 with one stout, and four or five slender spines at its base ; molar 

 tubercle well defined but not prominent. Palp three-jointed, the 

 first stouter and longer than the second or third. Outer branch 

 of the first maxillae rather broad, tipped with about ten simple 

 curved spines, the inner border bears a series of long hairs, which 

 are confined to the middle third ; inner branch short, with four 

 curved branched setre at the summit. Palp of the maxillipedes 

 with the superior lobes elongated and clothed at their apices with 

 long setae, the third and fourth joints are about one-third shorter 

 than the fifth. First pair of legs rather slender; the fourth joint 

 is armed inferiorly with four stoutish spines, two near the 

 middle and two at the distal extremity ; the fifth joint has three 

 spines, and the sixth four, the distal one being stouter than those 

 preceding ; the seventh joint has a pair of unequal spinules 

 arising from the base of the large terminal spine. The inner 

 ramus of the first pleopods is triangular, with the sides equal ;. 

 the outer ramus is oblong, and becomes wider as the subtruncated 

 summit is approached. The rami of the second pair are similar 

 to the first in shape, the inner ramus bears a subfusiform stylet 

 at its base, the distal half projects beyond the ramus, and is 

 suddenly narrowed and quite glabrous. Outer ramus of the 

 fifth pair with a dome-shaped apex and a papilliform process 

 near the middle of the lamina above the sutural line ; 



