360 DE. H. J. HANSEN ON THE 



Antennulae reach scarcely to the front lateral angle of thorax. 

 Peduncle rather thick, its third joint slightly shorter than the 

 second. Elagellum rather robust ; first joint about two and a 

 half times as long as the three distal joints together, furnished 

 with a good number of moderately long sensory hairs ; terminal 

 setae short. 



Peduncle of antennae with the penultimate joint scarcely half 

 as long as the terminal one. 



Epimera of second thoracic segment produced into rather 

 large, oblong processes ; processes of the epimera of second to 

 sixth segment increase gradually in size backwards, so that those 

 of sixth segment are very long, considerably longer than in any 

 other species ; posterior margin of epimera of second to fifth 

 segments conspicuously concave above the base of the process. 

 Even the lateral posterior angle of first segment is produced into 

 a rather good-sized process, and the posterior margin above its 

 base is strongly concave. The processes from last pair of 

 epimera are rather small. 



Seventh thoracic legs less slender than in E. Grimaldn ; 

 fourth joint slightly longer than broad aud considerably shorter 

 than fifth ; fourth and fifth joints on the lower surface with 

 several spines more or less distant from the inner margin, and 

 with numerous setse more or less distant from the outer margin. 



Last abdominal segment has on the upper surface a pair of 

 deep, angular, sublateral impressions and a deep, transverse, 

 anteriorly semicircular central impression at a short distance 

 from the base. Hind margin about two-fifths as long as the 

 breadth of the segment, rather deeply emarginate ; lateral angles 

 broadly rounded, each with two movable spines near each other, 

 the inner of which is long. 



TJropoda rather large ; endopod, when parallel with the axis 

 of the animal, reaches slightly beyond the abdomen. 



Length 9 mm. 



Occurrence. — The species was established on a large number 

 of specimens, without locality, forwarded many years ago by 

 Mr. A. H. Riise, apothecary in St. Thomas Island. Mr. Riise had 

 presented the Copenhagen Museum with a rich collection of 

 Crustacea (aud numerous other marine animals), almost all 

 collected by himself at the Danish Islands in the West Indies ; 

 for that reason I wrote in 1890 that this species was probably 

 from the "West Indies, but this supposition must be erroneous, 



