FEOM THE GUI.F OF GUINEA. 43 



in Flevrcn.ma aldcmhwle; seta? on both branches plumose. The mouth-organs also 

 as in P. abdominrie, but the anterior foot-jaw bears two elongate spines which spring 

 from a prominent basal part near its extremity. The distal processes of the maxiUte 

 appear to be less produced than in Pleuromma abdominale. The first pair of swimming- 

 feet are smaller than the following three pairs ; the posterior outer aspect of the basal 

 joint of the inner branch is beset with numerous fine cilia, and the outer margin of 

 the middle joint is fringed with fine hairs. The exterior margin of the second, and the 

 upper half of the third, segment of the outer branch are also fringed with fine hairs, 

 while the lower half of the third segment is finely serrate. The outer branch of the 

 second pair of swimming-feet on both sides has the first segment " deeply excavated at 

 the base ;" the excavation is bounded interiorly by two strong, upward-directed, curved 

 spines. There is no " thumb-like prominence " on the basal segment of the third pair 

 of feet, as in 'Pleuromma ahdomhwle. The fourth pair of feet closely resemble the 

 preceding pair. The last segment of the outer branch of the first pair terminates in a 

 long stout seta, plumose on the inner margin. The outer branch of the second, tliird, 

 and fourth pairs terminates in a moderately short, stout, sabre-like spine, the inner 

 margin fringed with cilia, the outer margin very faintly toothed. The fifth pair of feet 

 strongly prehensile ; one branch (the right ?) terminates in a clumsy claw-like segment. 

 A small spine springs from near the proximal end of the penultimate segment. Tlie 

 last segment of the other branch is furnished, on the inner side and near the base, with 

 a moderately long, stout process, and two peculiar, stalked ap^Dendages. There is also 

 at the base of the last segment a thin plate having a saw-like edge, and partly sur- 

 rounded with delicate cilia ; both branches of the fifth feet are about the same leuo-th. 

 Abdomen 4-jointed; joints subequal. Caudal stylets twice the len"-th of the last 

 abdominal segment, and each furnished with six setae, four of them on the rounded 

 extremity of the stylet, one on the outer margin, and a very small slender seta on the 

 inner margin. All the setiB are densely plumose. 



Habitat. Lat. 1° 55' 5" N., long. 5° 55' 5" E., 360 fathoms tow-netting, January 22nd 

 (day collection). 



Only one specimen — a male — of this fine species was obtained. 



Genus Heteroch^eta, Claus. 



HeterochiBta, Claus, Die fi'eilebendeu Copepodeu (1863). 



HETEROCHiETA SPINIFRONS, ClaUS. 



1863. Heterochatd spinifrons, Claus, loc. cit. p. 182, pi. xxxii. figs. 8, 9, 14, 16. 

 1883. Heterochata spinifrons, Brady, Report ' Chall.' Copep. p. 49, pi. xiii. figs. 1-13. 



Habitat. Station 2, 25 fathoms tow-netting, January 1st (night collection). Lat. 

 3° 58' N., long. 3° 42' W., 50 fathoms tow-netting, January 13th (night collection). 

 Station 14, 10 fathoms, January 21st (night collection). Off Sao Thome Island (lat. 

 0° 3i' N., long. 6° 30' 4" E.), 20 fathoms, January 23rd (day collection). Station 23, 

 235 fathoms, February 5th (day collection). 



6* 



