598 



CRUSTACEA. 



Kegulus LUCIDTTS. 



Rostrum prmlongum, recurvatum, acuminatum, versus basin liorizon- 

 taliter sensim latius deinde lateribus subparallelum, supra 8-9-den- 

 tatum, infra 3-dentatum. Squama antennalis perangusta, rostro paulo 

 brevior, dentibus tribus externis parvulis. Pedes 2di crassi, manu 

 oblongd, digitis dimidio manus brevioribus, parce hiantibus. Pedes 6 

 postici spai'sim laxeque pubescentes. 



Beak very long, recurved, long acuminate, gradually broader towards 

 base, then having the sides nearly parallel over the eyes, above 

 eight or nine-toothed, below three-toothed. Antennary scale very 

 narrow, a little shorter than beak, the three teeth of outer margin 

 very small. Feet of second pair stout, hand oblong, fingers not 

 half as long as hand, sparingly gaping. Six posterior feet sparsely 

 lax pubescent. 



Plate 39, fig. 5 a, female, much enlarged ; b, outline of beak ; c, d, 

 e, the outer maxilliped, foot of first pair, and of second pair, severally, 

 in their relative position as regards one another and the beak ; /, base 

 of inner antennae; /', part of the slender flagellum near middle; g, 

 scale of outer antennae; 7i, part of flagellum of outer antennae; i, 

 mandible ; Tc, first maxilla ; I, first maxilliped ; m, second maxilliped ; 

 n, outer maxilliped ; o, outline of back of abdomen ; p, side of one of 

 abdominal segments ; q, eggs, natural colour. 



Off Assumption Island, one of the Ladrones, thirty miles distant ; 

 taken December 30, 1841. 



Length, nine lines. Colourless, except faint red in parts of abdo- 

 minal segments, and deep red internally in thorax ; beak and extre- 

 mities of basal scale of outer antennae, orange. Yery brilliantly phos- 

 phorescent. Caudal segment slender tapering, with apex narrow and 

 bearing two minute spines, also two pairs of spines on lateral margin. 

 Outer caudal lamella not jointed, the outer margin ciliated, as well as 

 inner extremity, but hairs short; lamellae a little shorter than caudal 

 segment. Flagellum of outer antennae longer than body. Flagella 



