GAMMARIDEA. 



tufts on both margins, but especially the lower. The third and fourth 

 pairs of feet are about equal. The basal joints of the following are 

 oblong, with the posterior margins serrulate, and a few minute setae 

 on the anterior margin. The setae of the other joints are short, and 

 in a few tufts, two or three to inside of joint. 



The small size of the mandibular palpus in this species and the fol- 

 lowing is peculiar. 



Gammarus asper, Dana, Proc. Amer. Acad. Sci., Boston, 209. 



Gammarus suluensis. 



Feminae: — Abdominis segmenta primum secundumque dorso in mar- 

 ginem posticitm 2-3-dentata, quartum etiam 2-acutum. Oouli subro- 

 tundati. Antennas lmce fere corporis longitudine, flagello longiore 

 quam basis, articulis oblongis, setis non brevioribus, appendice brevis- 

 simd, 3-articidatd; 2dce fere dimidio breviores, flagello plus dimidio 

 breviore quam basis, basi parce breviore quam basis lmarum. Pedes 

 4 antici subasqui, parvi, \mi minores ; manibus paulo oblongis, apice 

 recte truncatis, infra brevissime pubescentibus, digito parvulo, <mar- 

 ginibus manus 2dos fere parallelis. Pedes sex postici paulo incequi, 

 setis paucis remoiis, brevibus, ad pedis extremitatem longiusculis. Styli 

 caudales ceque producti. [An femina G. asperi ?] 



Body rather stout. First and second abdominal segments having the 

 posterior margin on the back two to three-dentate, fourth also two- 

 acute. Eyes subrotund. Superior antennae as long as body, flagel- 

 lum longer than base, its joints oblong, the setse as long as the 

 joints, appendage very short, three-jointed; inferior pair nearly 

 half shorter, flagellum not half as long as base, base hardly as long 

 as base of superior pair. Four anterior feet subequal, small, first 

 pair the smaller, hands a little oblong, straight, truncate at apex, 

 below very short pubescent, margins of hand of second pair nearly 

 parallel, finger very small. Six posterior feet a little unequal, setae 

 few, remote, rather long at the base of the claw. 



Plate 65, fig. 3a, animal, enlarged; b, b', mandible, in different 

 positions; c, d, inner maxillae, ibid.; d, second pair of maxillae; e, 

 maxillipeds ; /, part of superior antennae. 



