104 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



4. uEga acuminata, n. sp. 



Plate II. Fig. 3-3 b. 



Only one specimen, a female without marsupium. 



Head. The frontal margin scarcely as concave on each side as in jTI. maxima, 

 the median elongation not reaching the middle of the interior margin of the 

 first joint of the antennulfe. The frontal plate conspicuously broader than 

 long, seen from the side shaped as in the preceding species, seen from in front 

 somewhat concave with projecting lateral margins. The eyes as in the preced- 

 ing species. 



Antennulce (Fig. 3). Keachuig considerably beyond the peduncle of the 

 antennae, to the middle of the first thoracic segment. The peduncle slightly 

 shorter than the flagellum; the basal joint, seen from in front, quite as broad 

 as long ; the dorsal surface somewhat convex ; the antero-interior angle a little 

 produced, acute-angled. The flagellum 18-jointed. 



Antennce. When reflexed, reaching to the posterior margin of the second 

 thoracic segment. The relation of the peduncle to the flagellum is about that 

 of 2 to 3 ; the flagellum 19-20-jointed. 



TJwrax (Fig. 3 a). The posterior margin of the epimera of the second to the 

 fifth segment and the corresponding margiti of the first segment sinuate, being 

 directed a little forward just inside the somewhat produced postero-lateral angle, 

 which is scarcely rectangular, but a little acute-angled. The epimera of the 

 sixth segment forming a transition between those of the fifth and of the seventh 

 segment, the last named pair posteriorly and laterally considerably produced 

 and acute. 



ITioracic Legs. They are robust, though scarcely as clumsy as in ^. maxima, 

 but very similar in shape and armature. In the three anterior pairs the claw 

 is somewhat longer ; the thick fourth joint in the first pair with one spine, in 

 the second with five, in the third ^dth six to eight spines. The spines on the 

 four posterior pairs scarcely as numerous as in the preceding species, but some- 

 what longer. 



Abdomen. The first segment almost totally covered, very conspicuously 

 broader than the fourth. The last segment scarcely 1^ times broader than long 

 (in Fig. 3 6 it seems to be proportionally broader, owing to the circumstance 

 that the figure presents the projection of the posterior segments) ; posteriorly 

 it is considerably produced, acute, with about three spines on each side of the 

 tip ; the dorsal surface is rather convex, median keel and sublateral depressions 

 scarcely visible. 



Uropods (Fig. 3 b). Much as in ^. maxima, so that only the more essential 

 differences will be pointed out. The outer ramus reaching a little beyond the 

 inner one ; the inner ramus is more deeply incised on the exterior side, and the 

 posterior margin is somewhat.longer : thus we obtain a distal part forming an 

 obtuse angle with the larger proximal part. 



