2302 CRUSTACEA. 



rotundatis, fronte obsolete prominulo. Antennce anticce 3-articulatce, 

 setis longis, und subclavatd, nudd. Antennce posticce 1 '-articulate, 

 articido secundo plus duplo longiore quam 5 vltimi simul sumti. Pedes 

 mandibidares 5-articulati, articido secundo brew, non longiore quam 

 tertius, basi elongate producto, primo ad apicem pariter producto, his 

 processibus duobus denticulatis instar mandibular. 



In upper view, very short ovate, rounded in front, subacute behind ; 

 in side view, subrotund; nearly straight along the back, like the 

 letter D in shape, with the angles rounded, the front not at all or 

 very slightly prominent. Spiculum cylindrical. Anterior antennas 

 three-jointed, setae long, one subclavate and naked. Posterior 

 antennae seven-jointed, second joint more than twice longer than 

 five last together. Mandibular feet five-jointed, second joint short, 

 not longer than third, base laterally very much prolonged, and 

 apex of first joint alike prolonged, the two processes together acting 

 as a mandible. 



Plate 91, fig. 8 a, dorsal view of animal, enlarged; I, side view; c, 

 ventral view, shell wide open (d, anterior antennae, with the spiculum 

 between; e, posterior antennse; /, mandibular feet; g, maxilla of first 

 pair; h, second pair or maxillipeds; i, h, feet of two pairs; m, muscle 

 for closing shell) ; d, anterior antenna, with spiculum; e, posterior an- 

 tenna; /, mandibular feet; g, h, maxillae of two pairs; i, 7c, legs of 

 two pairs. 



In the Atlantic, latitude 1° south, longitude 18° west, November 

 5, 1838; also, latitude 11° south, longitude 12° west, May, 1842, at 

 which time the dissections were made. 



Length, one fifteenth of an inch. Nearly colourless, or a slight shade 

 of dirty yellow, with a tinge of green. Less diaphanous than the 

 Conclioeeia agilis. Swims with rapidity. 



This species resembles the following, but has not the front project- 

 ing, or but obsoletely so, and in an upper view the front is rounded. 



The spiculum has an obtuse apex. The anterior antennae have one 

 seta much longer than the four others, and curved, and it is incrassate 

 towards apex. The organ tapers a little, and is stouter than in the 

 Conchwcia agilis. The second joint of the posterior antennae is longer 



