

CRUSTACEA. 





Plate 62, fig. 5 a, animal, enlarged ; b, upper view of head ; c, part of 

 base of inferior antennae; d, part of flagellum of same ; e,e', mandible 

 in different positions ; /, maxilla of first pair ; g, maxillipeds ; g', same, 

 more enlarged ; h, leg of second pair ; i, ibid, of third or fourth pair j 

 h, ibid, of fifth pair; Z, ibid, of sixth; m, ibid, of seventh pair; n, 

 abdominal natatory; o, extremity of abdomen, upper view; p, stylets 

 of second pair. 



Sooloo Sea, Feb. 3, 1842. 



Length three lines. The projecting front is rounded anteriorly, 

 and the bases of the superior antennae may be seen through it. The 

 smaller branch of the superior antennae is one-fourth shorter than the 

 other. The flagellum of the second pair has the joint many times 

 longer than broad and very slender ; and near the apex of each there 

 is a short process, a little vermiform in shape, which has an appearance 

 of being three-jointed. The mandible is pointed at summit, and has 

 two or three teeth. The palpus is three-jointed, the first joint very- 

 short, the second longer than the third, the third or last bears from an 

 oblique space at apex a cluster of setae nearly as long as the joint. 

 The antepenult joint of the legs of the third and fourth pairs is quite 

 short, being more than half shorter than the preceding. The bases of 

 the last six legs are serrulate behind ; and the joints below are serrate 

 by the bases of the setae, which setae are stout and spiniform, but inter- 

 mingled with long plumose hairs, on the fifth pair of legs especially. 

 The claw of the fifth pair is a little nodulose along one side. 



Urothoe irrostratus. 



U. rostrato similis. Frons non rostratus. Flagellum antemiarum lma- 

 rum Q-7-articulatum basi brevity; appendix perbrevis, 2-%-articulata. 

 Tarsi pedum iti et 5ti margine intemo noduloso, fere arcuato. 



Near the rostratus. Front not rostrate. Flagellum of the superior 

 antennae six or seven jointed, shorter than the base ; appendage 

 very short, two or three-jointed. Tarsi of feet of fourth and fifth 

 pairs nodulose along inner side, this side somewhat arcuate. 



