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II. On four new British Amphipoda. By the Rev. Thomas E. R. Stebbing, M.A., and 



David Eobeetson, F.L.S., F.G.S. 



Eeceived September 19th, 1889, read November 19tli, 1889. 



[Plates V., VI.] 



1. SOPHROSYNE ROBERTSON!, D. Sp. (Plate V. A.) 



Rostrum minute ; the body moderately compressed, with rounded back ; the hinder 

 angles of the first pleon-segment slightly rounded, those of the second squared, those of 

 the third strongly produced upwards, so that a deep cavity is formed on either side 

 between these and the arched dorsal surface of the segment ; the much shallower fourth 

 segment forms dorsally three little humps, two median and one distal ; the fifth and 

 sixth segments are very small. The integument is closely speckled. 



Ei/es not perceived. 



Upper mitennce. First joint shorter than the head, once and a half as long as broad, 

 as long as the six-jointed flagellum, the second joint not half as long as the first, and 

 about twice as long as the thii'd; the flagellum tapering, the first joint narrower but a 

 little longer than the last of the peduncle, each joint with one or two filaments; the 

 secondary flagellum slender, three-jointed, the last joint minute. 



Lower mitennce. Gland-cone very prominent ; third joint longer than broad, fourth 

 joint longer than the fifth ; ihe flagellum eight-jointed, slender, tapering, the first six 

 joints together being about as long as the fourth joint of the peduncle. 



Mandibles. The trunk slender, the cutting-edge narrow, apparently with a denticle 

 at either end ; molar tubercle wanting ; palp set far forward, much longer than the 

 trunk, first joint short, second elongate, slightly curved near the base, with one spine 

 near the distal end, the third joint as long as the second, distally truncate, with four 

 unequal spines on the extremity and one a little below it. 



First maxilloe. The inner plate small and low down ; the outer plate forming a single 

 apical tooth, with a little denticle on its side ; the palp was broken in dissection. 



Second maxillce. The inner plate much shorter and narrower than tlie outer, with 

 three minute setules near or at the rounded apex, the much larger outer plate having 

 four setules similarly situated. 



Maxillipeds. The inner plate very small, not reaching to the base of the outer plate, 

 carrying a single spinule on the apex ; one of the pair of plates was in the specimen 

 much smaller than the other; the outer plate longer but narrower than the first joint 

 of the peduncle, having two or three spinules on the inner margin, and four somewhat 

 larger on the apex ; the first joint of the peduncle rather longer than broad, the second 

 much longer, with two groups of spines on the inner margin and one at the outer apex ; 



