GAMMARIDEA. 



925 



gins nearly parallel, an obtuse tooth at lower apex, finger long and 

 stout. Feet of fifth, sixth, and seventh pairs subequal, the fifth 

 smallest, first joint broad, third rather broad, the rest rather nar- 

 row, setae exceedingly short, not one-fourth as long as breadth of 

 joint. 

 Female : — Base of second antennae as long as the flagellum. Feet of 

 second pair having a stout hand, which is oblong, arcuate below, 

 with the palm nearly straight, and armed with a small tooth towards 

 apex. 



Plate 63, figs, lo toe, male; f to o, female: — a, male, enlarged; 

 b, part of flagellum of superior antennae ; c, maxillipeds ; d, leg of 

 first pair ; e, ibid, of sixth pair.—/, female, enlarged ; g, mandible ; h, 

 maxilla of first pair; i, part of maxilla of second pair; k, maxilli- 

 peds ; I, hand of first pair of legs ; m, ibid, of second pair ; n, leg of 

 seventh pair ; o, caudal stylets and extremity of abdomen. 



Rio Janeiro. 



Length, three to four lines. 



Male. — The penult joint of the base of the inferior antennae is rather 

 longer than the last, and is more than half the length of the flagel- 

 lum. The carpus (or fourth joint) of the first pair of legs is trian- 

 gular, with the lower apex obtuse ; the third joint is much longer 

 than the fourth, but similarly triangular, the lower apex being quite 

 prominent; the finger is full two-thirds as long as the hand, and 

 applies itself against the outer two-thirds (or three-fourths) of the 

 lower margin, which is a little oblique. The hand of the second pair 

 is truncate somewhat obliquely at apex, and is but little narrower in 

 this part than behind, owing to the prominent tooth forming the lower 

 apex of the extremity. The under side of the hand is in part pubes- 

 cent. The finger is curved, and has two slight projections towards 

 base on inner side. The third joint of the six posterior legs has the 

 posterior apex triangulately prolonged, nearly as far as to apex of the 

 fourth joint. The fifth joint in the sixth pair has seven or eight very 

 minute setules, or sets of setules, on the inner margin. 



Female: — The carpus of the hand of the first pair is rather 

 longer than the third joint ; the third joint has the lower apex very 



232 



