CALIGOIDEA. 1373 



Lepidopus armatus. 



Corpus oblongum, posticd sensim latins. Carapax subquadratus, posticd 

 paulo latior, margine postico vix arcuato. Segmenta duo sequentia 

 subcequa, prof wide bilobata, alls grandibus, fere rotundatis. Abdomen 

 oblongurn, carapace valde longius, posticd non angustius, paulo bilo- 

 batum, lobis rotundatis. Antennae postico3 ad apicem elongate^ falciformes 

 et denticulis biseriatis armatw, articulo penultimo subquadrato. Pedes 

 paris secundi crassi, artictdo penultimo ad apicem spinigero, ultimo 

 crassissimo, super fide terminali oblong a, squamatd, squamulis spinuld 

 armatis. 



Body oblong, gradually broader posteriorly. Carapax subquadrate, a 

 little the broadest behind, posterior margin scarcely at all arcuate; 

 two following segments nearly equal and very deeply bilobate, 

 wings large, subrotund. Abdomen oblong, much longer than cara- 

 pax, not narrower behind, lobes rounded. Anterior antennas termi- 

 nating in a long slender joint, curved like a sickle and set with two 

 rows of teeth, preceding joint subquadrate. Large prehensile feet 

 having a stout spine at apex of penult joint, the last joint very 

 stout, its lower surface oblong and covered with scales. 



Plate 95, fig. 5 a, dorsal view, enlarged; a', ventral view; b, buccal 

 trunk, with maxilla either side ; c, extremity of the same ; d, separate 

 view of maxilla ; e, posterior antennae ; /, first pair of feet ; g, second 

 or large pair of prehensile feet ; h, first pair of natatories ; i, second 

 pair of natatories ; k, one of two posterior pairs of natatories. 



From a fish of the genus Mustelus (family of Sharks), in the 

 market at Rio Janeiro ; only two specimens were obtained. 



Length, one-third of an inch. Colour, brownish. 

 " The body consists of five segments, of which the last is quite small, 

 and is concealed beneath the penult. The frontal segment of the 

 carapax is larger than usual, and hardly shorter at middle. The 

 anterior antennae arise from it on either side, and are quite small and 

 two-jointed, as usual. The second joint is about as long as the first, 



and more slender. 



344 



