882 



CRUSTACEA. 



are more than twice their length in breadth ; the joints of the flagel- 

 lum of the superior antennae are full four times as long as broad. 

 The tarsi of the posterior legs are very slender, nearly straight, and 

 have a seta below near apex. The fourth joint of the second pair of 

 legs is but little broader than the hand. There are no hairs, setae, or 

 notches on the lateral margin of the three anterior abdominal seg- 

 ments. The first joint of the fifth pair of legs is rather narrow, of 

 the seventh quite broad. 



Orchestia Pickeringii. 



Maris : — Epimerce mediocres, 5tce Ains paulo breviores. Antenna?, 2d.ce 

 fere dvmidii corporis longitudine, basi sat brevi, flagello longiore sub- 

 nudo, articulis oblongis, setis paucis semidiametro articulorum nun 

 longioribus. Antenna? l?nce dimidio basis infer iorum breviores, flagello 

 3-artwidato. Pedes \mi parvuli, rnanu subtriangidatd, paulo oblongd, 

 apice truncatd et latiwe, digito brevi. Pedes 2di manu pervalidd con- 

 fecti, manu ovatd, infra et supra bene areuatd, palmd non excavatd, 

 versus digiti basin parce bilobatd, lobo lmo rotund ato, 2do subrectan- 

 gulato. Articulus 5tus pedis 7 mi tenuis, setis perbrevibus, inferis (in 

 paribus sex) semidiametro articuli non longioribus, supernis brevio- 

 ribus. 



Male: — Epimerals of moderate size, fifth a little shorter than fourth. 

 Inferior antennae about half as long as body, base rather short, 

 flagellum longer than base, joints oblong, setae few, not longer than 

 semidiameter of joints. Superior antennae not half as long as base 

 of inferior, flagellum three-jointed. Feet of first pair very small, 

 hand subtriangular, oblong, apex truncate, broador, finger short. 

 Hand of second pair very stout, ovate, above and below arcuate, 

 without a tooth or angle below at termination of palm, palm con- 

 vex and not excavate, naked, having two very low prominences 

 near base of finger, the first rounded and minutely setulous, the 

 second subrectangular. Fifth joint of seventh pair of legs slender, 

 setae in six sets on under side, not longer than half the diameter 

 of the joint, still shorter on upper side of joint. 



Plate 59, fig. 9 a, male, enlarged ; b, superior antenna ; c, part of 



