FEOM THE GULF OF GUINEA. 65 



The maxillte are well developed and provided witb a stout bilobed palp — one lobe 

 bearing long plumose, the other aculeate setae (tig. 15). Anterior foot-jaws large, 

 5-jointed, the first joint about twice the lengtli of the remaining portion, the three apical 

 joints very sliort ; the third and fourth joints bear each one, and the last thi-ee, 

 moderately long aculeate setae ; the anterior foot-jaws are also provided with four 

 marginal setiferous lobes — three on the first joint and one on the proximal end of the 

 second. Posterior foot-jaws smaller, 2-jointed, and bearing several stout marginal and 

 terminal setae ; the last joint is comparatively short (fig. 17). The last joint of the outer 

 branches of the first four pairs of swimming-feet are each provided with a long slender 

 terminal spine, very finely serrate on the outer and ciliate on the inner edge, and also 

 with several long plumose seta; ; the inner branches, which are shorter than the outer, 

 bear two long terminal setse, and a sub terminal one. In the first pair, which differ from 

 the others, the exterior margin of the outer branch is armed with three stout spines and a 

 subterminal spiniform seta, while the interior margin of the inner branch bears three 

 processes resembling somewhat the dilated bases of rudimentary hairs. The inner 

 margin of the second basal joint is also armed with several short spines (fig. IS). 

 Abdomen slender, 3-jointed, the middle segment scarcely half the length of either the 

 first or third. Caudal stylets very slender, once and a half the length of the abdomen, 

 bearing each four long terminal setae, and a small subterminal seta exteriorly, while a 

 moderately long seta springs from the outer margin and near the base of each stylet, as 

 shown in figure 21. 



Rabitat. Lat. 1° 65' 5" N., long. 5° 55' 5" E., 360 fathoms, tow-net gathering. Collected 

 during the day, January 22nd. Temperatuj-e of the water about 43° F. Lat. 4° 24' 7" S., 

 long. 10 1' 8" E., in tow-net gatherings from 235 fathoms and 185 fathoms. Collected 

 between 11 a.m. and 3.30 p.m., February 5th. Temperature of the water at 200 fathoms 

 55° E. A considerable number of specimens were obtained in the first of the three 

 ffatherinajs. No males were observed. 



This species has a close general resemblance to Corymira gracilis, Brady, and I was at 

 first incHued to ascribe it to that genus, but a further study of the structure of the animal 

 showed that there were differences between it and Qorijnura so important as to make its 

 position in that genus untenable (see remarks to description of genus, p. 61). 



Genus Acartia, Dana. 



Acartia, Dana, Amer. Journ. Sci. 1846 ; Brady, Report ' Chall/ Coi^ep. 1883. 



Dias, Lilljcborg, Crust, ex. ord. trib. 1853 ; Glaus, Die freilebend. Copep. 1863 j Boeck, Oversigt Norg. 

 Copep. 1864 ; Brady, Monogr. Brit. Copep. 1878. 



Acartia laxa, Dana. 



1852. Acartia laxa, Dana, Crust. U.S. Expl. Exped. p. 1123, pi. Ixxix. figs. 5 a-c. 

 1883. Acartia laxa, Brady, Report ' Chall.' Copep. p. 73, pi. xxxii. figs. 1-11. 



Habited. Station 2, 25 fathoms, tow-netting, January 1st (night collection). Station 9, 

 50 fathoms, January 10th (day collection). Ofl' Sao Thome Island (lat. 0° 38' 6" N., 



SECOND SERIES. — ZOOLOGY, VOL. VI. 9 



