

CRUSTACEA. 



Protella GRACILIS. 



Maris: — Corpus gracile, aculeis tuberculisve turn ornatum, fironte obtuso, 

 segmento thoracis lmo paulo longiore quam caput, segmentis 2do Uio 

 Ato 5to mbwquis, bene oblongis. Antennas lmce gracillimce, corpore 

 longmres, basi paulo breviore quam corpus, articulis 2do Stioque sub- 

 cvquis, flagello plus dimidio longiore quam articulus precedens ; 2dce 

 articulis lmarum duobus basalibus parce longiores. Manus Ima 

 parvula, carpo non h-eviore quam manus; 2da plus quadruplo lon- 

 gior, sat angusta, palmdfere nudd, dentibus tribus armatd, uno externo* 

 acuto, uno prope hunc interno acuto, uno subapicali truncato rhombico. 

 Pedes rudimentarii tenuiter styliformes, segmento paulo breviores. 

 Brancliia? anguste elliptical. 



FeminaB : — Manus 2da vix latior, infra arcuata, palmd spinulosd, 3- 

 dentatd, dente uno externo, duobus acutis brevissimis subapicalibus. 



Male : — Body slender, without spines or tubercles, front obtuse, first 

 segment of thorax a little longer than head ; second, third, fourth, 

 and fifth segments subequal, rather oblong. Superior antenna? very 

 slender, longer than the body; the base but little shorter than body; 

 second and third joints of base subequal ; flagellum more than one 

 and a half times the preceding joint. Hand of first pair very 

 small, carpus not shorter. Hand of second pair four times as long 

 as hand of first pair, rather narrow ; palm nearly naked, armed 

 with three teeth, one external, one internal, and one subapical, 

 truncate and oblique. Kudimentary feet slender and styliform, a 

 little shorter than segment. Branchiae narrow subelliptic. 



Female : — Hand of second pair hardly broader than in male ; palm 

 arcuate, spinulous, short three-toothed, one exterior acute, and two 

 acute very short subapical teeth. 



Plate 54, fig. 2 a, male, enlarged ; b, part of flagellum of superior 

 antennas; c, extremity of leg of last pair; d, female; d', part of fla- 

 gellum of superior antennae, ibid.; e, head of another variety; /, hand 

 of female of second pair of legs. 



From thirty-one fathoms water, in Balabac Passage, attached to a 

 Plumularia and a Gorgonia. 



* The finger closes upon the hand just inside of the tooth here referred to as the exterior. 



