70 ME. T. SCOTT ON ENTOMOSTEACA 



and sixth joints, counting from the end. The sixth joint, which is nearly as long as the 

 remaining' portion of the antenna, has a rounded excavation on the upper edge and near 

 the proximal end; the lower side of the excavation is produced into a stout tooth-like 

 lobe ; the fifth joint, still counting from the end of the antenna, is about half the length 

 of tlie preceding, and bears a styloid process on its upper margin and a long plumose 

 seta at the upper distal angle ; the ultimate and penultimate joints are also furnished 

 Avith a number of long plumose setae (PI. VII. fig. 42). The posterior antennae and 

 mouth-organs as in Paracartia spinicaudata. The first four pairs of swimming-feet 

 similar to those of Acartia. The fifth pair is largely develojied, that of the right side 

 large, 4-jointed, the first and second joints stout, the other two slender, elongate; the 

 fourth joint appears as if it were articulated to the side of the third. There is a stout 

 digitiform process on the inner side of the upper half of the second joint, and near the 

 middle of the third joint the outer margin is produced into a bluntly triangular lobe ; the 

 last joint bears an apical appendage, the basal part of which is tumid, the extremity 

 slender and setiform. The right foot has an inner rudimentary second branch composed 

 of one joint about equal in length to the first joint of the outer branch. The left foot, 

 which is stout, scarcely reaches to the middle of the second joint of the principal branch 

 of the right foot, and appears to be 3-jointed ; the second joint is furnished with a 

 membraneous, curved (?) sexual process, as shown in figure 9. Abdomen composed of five 

 segments, the first short, of greater width than the next, the outline of the sides rounded 

 (PL VIII. fig. 15) ; the second and third joints are long, while the combined length of 

 the fourth and fifth is scarcely equal to the third. The stylets are somewhat longer 

 than the last abdominal segment, and have the third apical seta, counting from the 

 outside, considerably longer than any of the others. 



Habitat. Loan da Harbour, in material collected with surface tow-net, on the afternoon 

 of Pebruary 15th. Several specimens, males only, were obtained. 



As females only of Paracartia spinicaudata, and males only of P. dubia, were obtained 

 in the tow-net gathering from Loanda Harbour, it is just possible that they may both 

 belong to the same species, but the difference between the two is so considerable and so 

 marked that it seems better, for the present at least, to describe them under separate 

 names. 



A species described and figured by I. C. Thompson in the ' Proceedings of the 

 Liverpool Biological Society,' vol. ii. p. Ill (1888), as Acartia verrucosa, resembles 

 somewhat the Paracartia spinicaudata of this Report ; but the difference in the form of 

 the fifth feet and in other important details is great enough to render them at least 

 specifically distinct. 



Genus iEiiDius, Brady. 



Aitidtus, Brady, Report ou the Copepoda of the ' Challenger' Expedition, 1883. 



J^TiDius AiiMATUS, Brady. 



1883. ALitdhis armatus, Brady, Report ' Chall.-" Copep. p. 7G, pi. x. figs. 5-16. 



Habitat. Station 2, 5 fathoms tow-netting, January 1st (night collection). Lat. 3° 58' 



