276 Part III. — Twenty-second Annual Report 



joints, is about 1* lmm. (about ^ of an inch), but that represented by figure 

 2 is slightly larger, and measures about 1*4 mm. The segments, especially 

 along their dorsal aspect, are rough with minute scattered spines. The 

 body is slender, as in the species previously described, but the fourth and 

 fifth segments are rather more dilated than the others. The cephalosome 

 is about equal in length to that of the first two segments of the metasome 

 combined. The first segment of the metasome is a small one, while the 

 next two are each rather longer and stouter than the one immediately 

 preceding ; the last segment of the metasome is considerably smaller than 

 the third one. The segmentation of the urosome (abdomen) somewhat 

 resembles that of Eudadylina similis, A. Scott. 



The antennules, which are short and stout, are apparently five-jointed, 

 as in those of the species referred to, and their armature is also similar to 

 that of Eudadylina similis, but, on the other hand, there is a distinct 

 difference in the proportional lengths of the joints, — the third being longer 

 than the second joint and the fourth scarcely twice as long as the ultimate 

 one (fig. 3). 



The antennae, which are moderately elongated, have a general resemblance 

 in their form and structure to those of the other described species ; but the 

 second joint, which is about as long as the third, is produced on the inner 

 aspect and near the distal end so as to form a single stout and prominent 

 spine, and a single powerful hook-like spine with a thickened base carrying 

 a few small setae is articulated to the extremity of the third joint (fig. 4). 



The mandibles and maxillae do not present any marked difference from 

 those of Eudadylina acuta, van Beneden. 



The first maxillipeds, which resemble the same appendages in Eudady- 

 lina similis, are armed with a moderately stout terminal claw, and the end 

 joint is furnished with a row of minute course denticles along the inner 

 edge (fig. 5). 



The second maxillipeds are large and strong and form powerful chelae; 

 they are somewhat similar in structure to those of Eudadylina similis, but 

 the extremity of the claw which impinges against the lower spoon-like 

 process has the stout apical tooth with a rounded hood-like covering 

 (fig. 6). 



In the first pair of thoracic feet both branches are two-jointed, and both 

 are moderately stout ; the inner branches are sparingly fringed with minute 

 setae, and armed with two apical spines of unequal length ; the outer 

 branches, which are rather shorter than the inner, are each furnished with 

 a fringe of minute setae on the outer margin of the first joint, while the 

 end joint bears several spines round its outer margin and apex ; the inner 

 spine is of moderate length, but the others are small (fig. 7). 



The structure of the second pair has a general resemblance to that of the 

 same pair in Eudadylina similis and E. acuta. The inner branches, which 

 are distinctly three-jointed, are considerably smaller than the outer ones, 

 the first joint bears a longitudinal row of small spines on its inner aspsct, 

 while the end joint carries two apical spines of moderate but unequal 

 length. The outer branches are stout and elongated, and, like the inner 

 ones, appear to consist of three joints, but the articulation between the first 

 and second joints is apparently nearly obsolete; two short spines which 

 have their bases dilated spring from the outer margin and near the distal 

 end of the elongated first joint; the third joint, which is short and rounded 

 at the extremity, is provided with a single and moderately stout subter- 

 minal spine, as shown in the drawing (fig. 8). 



The third and fourth pairs are nearly alike, and resemble the same two 

 pairs in Eudadylina similis, except that the inner branches are furnished 

 with a number of scattered spinules on their outer aspect; the outer 

 branches are each of them rounded at the extremity, and provided with 



