GAMMARIDEA. 949 



truncate palmam efficiente, palmd paulo excavatd et angulo infra fini- 

 ente, digito dimidii manus longitudine. 



Female: — Epimerals moderately large. A small spine or two on back 

 of first, second, and fourth abdominal segments. Superior antennae 

 nearly three-fourths the body in length, base shorter than flagel- 

 lum, second joint a little the longest, flagellum about twenty-one- 

 jointed; inferior very slender, nearly half shorter than the superior, 

 flagellum shorter than base, about eight-jointed. Four anterior 

 feet subequal, hands quite small, oblong, apex somewhat rounded, 

 rather dense hirsute below, and also on carpus, the second pair a 

 little the longer, finger small. Six posterior feet subequal, setae 

 numerous, rather longer than the diameter of the fifth joint. 



Male: — Feet of second pair stout, hand large, oblong, narrower at 

 base but margins nearly parallel, lower margin with a few very 

 short setae, apex obliquely truncate forming the palm, palm a little 

 excavate and ending below in an angle, finger half as long as hand. 



Plate 65, fig. 4 a, animal (female), enlarged; h, c, portions of an- 

 tennae ; d, hand of second pair in male. 



Tongatabu, in shallow waters of the lagoon, among sea-weed. 



Length, five lines. Colour of back, nearly white. The head is nearly 

 as long as high, and about twice as long as first thoracic segment. 

 The third joint of base of superior antennae is half shorter than pre- 

 ceding ; the last joint of base of inferior pair a little shorter than the 

 preceding, and the prolonged lower apex of first joint extends to apex 

 of second joint; this second joint is not longer than broad; the flagel- 

 lum is about as long as last two basal joints. The hand of second 

 pair in male has a few setae at intervals on both upper and lower 

 margin; the finger when closed leaves a space between it and the 

 palm; the fourth joint is very small and narrow triangular, sub- 

 acute below, situated between the lower part of the preceding, and 

 the hand ; this preceding joint is subtriangular, subacute above and 

 below, and about as long as broad. The third and fourth pairs of 

 feet are slender and rather long. The last three pairs have short setae 

 on margins of first joint ; the setae of the other joints are in tufts, of 

 which there are three or four on the opposite sides of each joint. 



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