CYCL0P01DEA. 



1095 



Plate 77, figs. 10 a, b, c, d, e, /, represent organs of a species found 

 abundant in the Atlantic, from October 18 to Nov. 12, 1838, latitude 

 6° 30' north, to 12° 40' south, longitude 21° 40' to 31° 30' west, and 

 it may be the same with one of the preceding species. The figure of 

 the antenna may not be quite accurate, as it was made before the 

 importance of attending strictly to the exact position of these organs 

 and the comparative lengths of the joints was understood. There are 

 four posterior joints to the cephalothorax. 



Figure 10a, represents the anterior antennae; b, the posterior; c, 

 the first pair of feet; d, the right genital foot; e, sl lateral view of 

 cephalothorax, showing position of beak and the alimentary cavity;/, 

 abdomen. 



As the species was figured, the tips of the anterior antennae are a 

 little anterior to line of beak. A specimen resembling it in this and 

 other respects (or having the tips only a little posterior to line of 

 beak), was obtained off the south end of Mindoro, East Indies, Ja- 

 nuary 22, 1842. 



Undina inornata. 



Fron8 rotundatus. Cephalothorax postice vix acutus, h-articulatus, seg- 

 mento postico brevi. Antennae, anticce corporis longitudine, setis perbre- 

 vibus, seta) articuli secundi (tertii?) longiusculd, recta), seta) apicali 

 postico) articuli longitudine, anticd penultimd suboblongd, posticd brevi, 

 jposticd antepenultimd articulum vix superante. Styli caudales parce 

 oblongi. 



Front rounded. Cephalothorax subacute behind, five-jointed, last 

 segment quite short. Anterior antennae as long as body, second joint 

 oblong; setae very short, one from second or third joint a little long 

 and straight, posterior apical seta as long as joint, anterior penult the 

 longest of the subapical, the posterior antepenult next longest, the 

 other subapical short. Abdomen five-jointed, segments subequal. 

 Caudal stylets sparingly oblong; setae spreading, not longer than 

 the abdomen, the second twice as long as first. 



Plate 77, fig. 11a, animal, enlarged; b, extremity of anterior an- 

 tennae ; c, one of the second pair of natatories ; d, posterior natatories. 



