FEOM THE GULF OF GUI^^EA. 87 



joint is as long as the preceding and fully twice the length of the terminal joint. The 

 joints of the apical portion of the posterior foot-jaws gradually decrease in length towards 

 the extremity; the fii-st joint is about twice the length of the third, the second is as 

 long as the third and fourth together, the terminal joint is very small (fig. 46). Inner 

 branches of the first pair of swimming-feet 3-jointed, and not longer than the first 

 two joints of the outer branch. Inner branches of the second, third, and fourth pairs 

 2-jointed. The basal angle of the short, tumid, terminal joint of the right fifth foot 

 is produced into a moderately long digitiform process, which appears to interlock with 

 the spoon-like apical part of the stout angularly curved terminal claw. The last joint 

 of the left foot is furnished with three stout apical spines, one of which is short, while 

 the longer one of the other two is about equal in length to the terminal joint (fig. 48). 

 Abdomen composed of four (? five) segments, the first and third segments are considerably 

 longer than the others. Caudal stylets longer than the third abdominal segment ; the 

 fourth seta of eanh stylet (counting from the outside) is about twice the length of the 

 others. 



Habitat. Libreville, at the mouth of the Gaboon River, in two surface gatherings- 

 one being collected near the highest point reached. 



Figure 47 shows the fifth feet of an immature female from the same locality. Only 

 three female specimens were obtained, which were all immature. 



The Poiitella here described seems to be nearly identical with PontelUna mediterranean 

 Claus, except that Claus's specimens were larger — 4 mm. There is also a difference in 

 the number of jomts that precede the three swollen ones of the right male antenna : 

 Claus describes the three swollen joints as "vom dreizehnten bis funfzehnten Gliede," 

 but in the ' Buccaneer ' specimens it is the sixth to the eighth joints that are swoUen. 

 Moreover, there is some difference in the armature of the prehensile part of the right fifth 

 foot ; in the ' Buccaneer ' specimens the " eight large and numerous small boat -like 

 knobs " described by Claus are wanting. But as these differences are comparatively 

 unimportant, and may be due to local causes, there appears to be no suflicient reason 

 to consider the ' Buccaneer ' specimens distinct from Pontella mediterranea, Claus, 

 except as a local variety. 



Genus Pontellopsis, Brady. 



{Pontellopsis, Brady, ' Challenger ' Copepoda, p. 85, 1883.) 

 ? Monops, Lubbock, 1853. 



Pontellopsis villosa, Brady. (PL VI. figs. 29-34.) 



Pontellopsis villosa, Brady, op. cit. p. 86, pi. xxxiv. figs. 10-13, pi. xxxv. figs. 14-20. 



Male. Length 1*85 mm. Right anterior antenna somewhat like that of Pontella 



plumosa, Dana, but differing in the armature and in the number and proportional length 



of the joints (fig. 34). The left anterior antenna, the posterior antennae, mouth-organs, 



and swimming-feet are similar to those of the female (see also pi. xxxv. figs. 14-20, 



