TEOM THE GULF OF GUINEA. 27 



spine. All the first four pairs of swimming-feet liave the inner margins of both branches 

 furnished with long plumose hairs. The fifth feet in the male are 1-branched — the 

 right short, 3-jointed, and terminating in two short spines of unequal length ; the left 

 5-jointed, apparently hinged between the first and second joints ; length of the joints 

 subequal, the last terminating in two small spines. Fifth pair of feet in the female 

 1-branched, 2-jointed, the last joint much narrower than the first and terminating in 

 one long and one short spiniform setse. 



Bahltat. Lat. 6° 34' N., long. 12° 39' W., surface, January 6th (day collection). Off 

 Accra, 3 fathoms, January 15th (night collection). Lat. 1" 55' 5" N., long. 5° 55' 5" E., 

 10, 20, 30, 360, and 160 fathoms, January 22nd (day collection). Station 18, surface 

 tow-netting, February 3rd (day collection). Station 21i (off the mouth of the Congo 

 River), surface tow-netting, February 6th (day collection). Lat. 5° 9' 8" S., long. 11° 

 10' 4" E., surface tow-netting, February 19th (day collection), &c. 



Paracalanus parvus occurred in 19 tow-nettings, 29 of which were surface and 20 

 under-surface gatherings. The under-surface tow-nettings ranged from 2^ to 460 

 fathoms. 11 of the surface and 16 of the under-surface tow-nettings were day col- 

 lections, while 18 surface and 4 under-surface were night collections, as in the 

 formu.la : — 



r 11 day collections, 

 r 29 surface 1 18 night ditto. 



Tow-nettmgs 49 < ^-.n ^ v^i. 



\ 20 under-surface X ^^ ^^^ ^^^^^O" 

 I 4 night ditto. 



This species was comparatively frequent in all the gatherings in which it was 

 observed. 



Paracalanus pyoai^L's (Claus). (PL I. figs. 1-8.) 



1863. Calanus pijffnueus, Claus, Die freilebenden Copepoden, p. 74. 



Female. Length 7 mm. (l-36th of an inch). Body robust, composed of four 



segments, the first being fully twice the entire length of the outer three ; rostrum short, 



stout, prominent. Anterior antennae reaching beyond the cephalothorax, 24-jointed, 



sparingly setiferous ; sette mostly small, except towards the extremity, where there are 



several moderately long hairs ; the proportional lengths of the joints are as shown in 



the formiila : — 



30 ■ 6 ■ .5 ■ 5 ■ .5 . 5 . 5 . 5 ■ G ■ 7 . 8 . 8 ■ 8 ■ 8 ■ 8 . 7 ■ S . 11 ■ 8 ■ 12 ■ U ■ 12 . lo . 15 

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24' 



Posterior antennoe small, provided with moderately long setse; the primary branch 

 composed of two nearly equal joints ; secondary branch fully half the length of the other ; 

 7-jointed, the third, fourth, and fifth joints very short, the others longer and subequal. 

 Mouth-organs as in Paracalanus j^arcus. The swimming-feet are also similar to those 

 of that species, but differ in their armature, especially in having the second as well as 

 the last joints of the outer branches of the second, third, and fourth pairs serrate on the 

 outer margin, in the terminal spines being proportionally smaller, and in both branches 



4* 



