FEOM THE GULF OF GUINEA. 83 



joints, the upper margins of these joints minutely denticulate (a j-inch objective is 

 required to see the denticulation distinctly). The 12th joint is not denticulate. 

 Mandible strongly toothed; the distal end is covered exteriorly with numerous short 

 spinous setae arranged in oblique rows ; the two inner teeth of the mandible are large 

 and wide apart. The posterior foot-jaws are somewhat similar to those of Labklocera 

 acuta, Dana. The third segment of the right fifth foot of the male has the base 

 produced into a long stout spine, and at the distal end is furnished with a long curved 

 and slender appendage, bearing two short claw-like processes at its extremity. The 

 left foot is 3-jointed ; the second joint is shorter than the first, the third is about equal 

 in length to the second and somewhat triangular in shape ; the apex terminates in 

 three teeth, the middle one being the longest. The fifth pair in the female are inter- 

 mediate between Labidocera detruncata and Labidocera acutifrons, Dana. Abdomen in 

 the male 4-jointed, in the female 3-jointed ; the middle segment in the female large and 

 tumid, the last segment of the male abdomen smaller than the other three, which are 

 subequal in length. 



The form here described differs from Labidocera, detruncata, as described and figured in 

 the ' Challenger ' Report, in the following particulars : — the right anterior male 

 antenna differs in the proportional length of the joints and in the absence of the 

 prominent denticulations on the 12th, 13th, and 11th joints, but especially on the 12th, 

 and also in the postero-lateral angles of the last thoracic segment being acutely and 

 strongly produced so as to resemble, in this respect, Labklocera acutifrovs. The fifth pair 

 of feet in the male of the variety here described resemble Dana's figure very closely, 

 much more so than that of the specimen figured in the Report on the ' Challenger ' 

 Copepoda. 



Habitat. Lat. 5° 58' N., long. 14' 20' W., surface, January 6th (one day and one night 

 collection). Off Sao Thome Island (lat. 32' 7" N., long. 6 31' 6" E.), 10 fathoms, 

 January 23rd (day collection). Lagoon, Sao Thome Island, surface, January 27th and 

 28th (one day and one night collection). Lat. 1 30' 3" S., long. 8 8' 6" E., surface, 

 February 3rd (night collection). Lat. 4° 55' 9" S., long. 10 47' 3" E., surface, Feb- 

 ruary 5th (night collection). Lat. 5 50' 5" S., long. 11' 17' 2" E., surface, February 8th 

 (night collection). Lat. G 39' 5" S., long. 11 24' 7" E., surface, February 8th (night 

 collection). 



This was comparatively a rare species in the ' Buccaneer ' collection. The above is a 

 full list of the localities where it was obtained. 



/_ 



Labidoceka Dakwinii (Lubbock). (PI. VI. figs. 39-42 ; PL VII. figs. 5, 6.) 



1853. Labidocera Danvinii, Lubbock, Ami. & Mag. Nat. Hist. ser. 2, vol. ii. p. 29, pi. i. figs. 1-11. 

 1892?. Labklucera Lubbockii, Giesbrecht, Pelag. Copep. Golfes von Neapel, p. 459, pis. 23, 25, 41. 



Length, male 2" 2 ram., female 2-4 mm. The forehead is broadly rounded, and docs not 

 possess any angular median projection. The last thoracic segment has the lateral angles 

 considerably produced, and in the male more so on the right side than the left, but the 



11* 



