FEOM THE GULF OF GUINEA. 45 



1856. Undina longipes, Lvibbock, Trans. Entom. Soc. p. 17, pi. vi. figs. 1-5. 



1883. Undina vulgaris, Brady, Report 'Cliall.' Copep. p. 53, pi. xv. figs. 11-15 ; pi. x\iii. fig. 6. 



Eabitat. Station 2, surface tow-ncttings, January 1st (niglit collection). Lat. 3° 58' N., 

 long. 3° 10' W., surface tow-netting, January 13tli (day collection). Lat. 1° 55' 5" N., 

 long. 5° 55' 5" E., 20, 35, and 460 fathoms tow-nettings, January 22nd (day collections). 

 Lagoon, Sao Thome Island, surface tow-netting, January 27th (night collection). Station 

 21, surface tow-netting, February l<th (day collection). Bananah Creek, Congo River, 

 surface tow-netting, Februaiy 7th (day collection). 



TIndina vulgaris was observed in 89 tow-nettings ; 51 of these were surface gatherings 

 and 38 under-surface, the depth of which ranged from 2 to 400 fathoms ; 20 of the 

 surface and 26 of the under-surface gatherings were collected during the day, while 

 31 of the surface and 12 of the under-surface gatherings were collected during the 

 night, as shown by the annexed formula : — 



f 20 day collections, 

 t 31 nio-] 



T H- .J^l^^^'f^^^ 1 31 night ditto. 



Tow-nettings 89< .^^ , ^.^^ 



1 38 under-surface / 26 day ditto. 



(. 12 night ditto. 



This Undina was comparatively common in the ' Buccaneer ' collections, both sexes 

 being equally frequent. It was also one of the more common of the ' Challenger ' 

 Copepoda. Another species (ZJwc^mw J>«rt(?i»^, Lubbock), which appears to have been 

 almost as common as Undina vulgaris in the ' Challenger ' collections, was entirely 

 absent from the ' Buccaneer ' tow-nettings, not a trace of it being observed, though 

 carefully sought for. 



Genus Euchieella, Giesbrecht (1891). 



Elenco del Copepodi pelagici, — R. Corvetta ' Vettor Pisani.' (Atti deUa Reale Accademia 

 dei Lincei, serie iv. Reudicoiiti, vol. v. pt. 1, p. 330.) 



? EUCHIRELLA MESSINENSIS (Claus). (PI. VI. figS. 15 & 16.) 



? Undina messinensis, Claus, Die freilebendeu Copepoden, p. 187, pi. 31. 



Length, exclusive of tail-setae, 5 mm. Body elongate, robust. Forehead subtruncate ; 



postero-lateral angles of the last thoracic segment rounded and furnished with a number 



of hairs. Anterior antennae reaching to near the extremity of the abdomen ; the left 



24-, the right 23-jointed, the proportional lengths of the joints nearly as in the annexed 



formula : — 



Eight antenna. 10 ■ 13 . 7 . 6 . 7 ■ 7 . 7 . 11 . 8 . 8 . 8 . 14 . 19 . 19 . 19 . 20 . IS . 20 . 18 . 13 . 13 . 13 . 14. 



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

 Left antenna. 10 . 13 . 7 . 6 . 6 . 7 . 6 . 8 .6.7.7. 8 . 14 . 15 . 20 . 19 . 20 . 18 . 20 . 17 . 14 . 13 . 11 . 14, 



The 3rd, 7th, 8th, 13th, 17th, and 20th joints are each furnished with a long j^lain 

 seta. The terminal joint bears three (or four ?) long setse, two of them plumose ; there 

 is also a plumose seta on the penultimate joint, and two stout short plumose hairs sjjring 

 from near the end of the basal joint. The posterior antennae have the secondary branch 



