TAKEN OFF NORTHUMBERLAND AND DURHAM. 213 



to separate it. But Dr. Giesbrecht has still more recently 

 restored the term Microsetella, and has been followed by 

 Professor G. O. Sars in his great work on the Crustacea of 

 Norway. The distinctive characters are perhaps as good as 

 are now generally held sufficient in other cases, and I here, 

 though with some misgivings, follow the lead of these excellent 

 authorities in reinstating the original name. The genus differs 

 from Ectinosoma chiefly in the greater length of the antennules 

 and tail set?e, and in its purely pelagic habitat. 



Microsetella rosea, Dana (Plate III., figs. 1-4). 



1852. Canthocamptus roseus, Dana, Crustacea of the U.S. 



Exploring Expedition, p. 1189, plate 83, fig. 10. 

 1892. Microsetella rosea, Giesbrecht, Systematik und 



Faunistik der pelagischen Copepoden des Golfes 



von Neapel, p. 550, Taf. 44, figs. 32, 35, 37, 38, 



41, 43) 46, 48, 49- 

 This species is easily distinguished from M. atlantica by its 

 larger size and its extremely long tail setae, which are not far 

 from twice as long as the body of the animal ; the feet of the 

 fifth pair are also quite different. The male is unknown. 

 Length (exclusive of tail setae) '80 mm. Only one specimen 

 was seen, notwithstanding a most careful hunt over the 

 entire washings from the dredge. The animals belonging to 

 this genus are, however, so far as at present known, entirely 

 pelagic in habit, and seem ill-adapted for life on the sea 

 bottom. It is therefore probable that our specimen was 

 captured by the dredge on its way up from the bottom, and 

 though the tow-nettings taken on the same excursion did not 

 contain further specimens, it is not unlikely that more might 

 have been obtained in nets worked at some distance from the 

 surface. This specimen was evidently imperfect, having, as 

 shown in the figures, lost many small setae from feet and 

 antennae. The only previously recorded habitats are the 

 Sooloo Sea (Dana), in lat. o°-ii° N., long. io8°-i24° W., 

 depth up to 1000 meters, and at Naples (Giesbrecht). 



