FEOM THE GULF OF GUINEA. 115 



definition of the genus, stated to eonsist of five segments, and in the drawings of CopUin 

 mirahllls the fourth pair of swimming-feet are I'eiJresented as attached to wliat is descrihed 

 as the last thoracic segment ; if this he correct, then, shouki a fifth pair of feet he present, 

 they would necessarily be attached to the same segment as the fourth pair, which Avould 

 be very unusual, the fifth pair only being usually attached to tlie last segment of the 

 thorax. In the species now described, if the abdomen be held to consist of five segments, 

 the appendages of the first segment are not a fifth pair of feet, and the fourth pair are 

 attached to what, in that case, is the last thoracic segment, and a separate segment, for 

 the support of a fifth pair of feet, is entirely absent. In these circumstances I prefer 

 to consider the abdomen as consisting of four segments and that the fourth pair of 

 swimming-feet are appendages of the second last segment of the thorax, and further that 

 the rudimentary appendages of the next, or last, thoracic segment are a fifth pair of feet, 

 because such an arrangement of the parts is more in harmony witli those of closely 

 allied genera. 



Genus Ltjbbockia, Clans. 



Lubbockia, Claus, Die freilebeiulcn CopeiJodcu, 1863 ; Brady, Report on the 

 Copepoda of the ' Challenger' Expedition, 1883. 



LUBCOCKIA SQUILLIMANA, Claus. 



1863. Lubbockia squiUimana, Claus, Die freilebenden Copcpodcn, p. 164, jil. xxv. figs. 1-5. 



1883. Lubbockia squiUimana, Brady, Report Chall. Copep. p. 118, pi. liii. figs. 12-16, pi. liv. figs. 1-7. 



Hcdntat. Station 3, 100 fathoms, January 2nd (day collection). Station 9, 25 fathoms, 

 January 10th (day collection). Lat. 1° 55' 5" N., long. 5 55' 5" E., 360 fathoms, 

 January 22nd (day collection). Station 23, surface and at 10 fathoms, February 5th (day 

 collection). Lat. 8° 30' 8" S., long. 12 5' 7" E., surface, February 9th (day collection), &c. 



Luhhockia squilUmana was observed in 39 tow-nettings, 13 of which were surface 

 gatherings and 26 under-surface. The under-surface gatherings were from various 

 depths from 10 to 360 fathoms ; 3 of the surface and 18 of the iinder-surface tow- 

 iiettings Avere day collections, while 10 surface and S under-surface were night collections, 

 as in the formula : — 



r 3 day collections. 



..• on f ^'^ '"''^'''''' i 10 night ditto. 



Tow-nettmgs 39 < " 



I 26 under-surface j 18 day ditto. 

 I 8 night ditto. 



Though generally distributed throughout the ar(^a represented in this Report, and 

 though observed in a considerable number of gatherings, Luhhockia was of less frequent 

 occurrence in the tow-nettings in which it was obtained than some other species with a 

 more restricted distribution. Specimens of both sexes were collected, but females were 

 much more common than males ; several females carrying ovisacs were taken. 



15* 



