78 ME. T. SCOTT ON ENTOMOSTEACA 



Lat. 1° 55' 5" N., long. 6° 56' 5" E., 10 and 30 fathoms, January 22ncl (day collections). 

 Libreville, Gaboon River, surface, January 28th (two day collections). Lat. 5° 5G' 5" S., 

 long. 11° 17' 2" E., surface, Eebruary 8tli (night collection). Loanda Harbour (seaward), 

 surface, Eebruary 1-Jth, &c. (day collection). 



This Centropages was observed in 49 tow-nettings, 33 of whicli were surface and 16 

 under-surfaee gatherings ; 11 of the surface and 11 of the under-surface tow-nettings 

 were day collections, and 22 surface and 5 under-surface were night collections, as shown 

 by the annexed formula : — 



11 day collections. 



I 

 122 



T H- ,^ r^^ ^^^^'^^^^ 1 22 night ditto, 



low-nettings 19 < «. & 



Lie under-surface | ^^ ^^y ditto. 

 (. 5 night ditto. 

 The under-surface tow-nettings were from depths ranging from 3 to 50 fathoms. This 

 species can be readily distiuguished, even in the immature stages, by the characteristic 

 ai'mature of the last thoracic segment. 



Centropages violacetjs (Claus). 



1863. Ichthi/ophorba violacea, Claus, Die freilebenden Copep. p. 199, pi. xxxi. figs. 13, 14. 

 1883. Centropages violaceus, Brady, Report Cliall. Copep. p. 83, pi. xxvii. figs. 1-14. 



Habitat. Station 2, 50 fathoms, January 1st (night collection). Station 9, 25 fathoms, 

 January 10th (day collection). Off Sao Thome Island (lat. 0° 32' 7" N., long. 6° 31' 6" E.), 

 10 fathoms, January 23rd (day collection). Lat. 1^ 47' 7" S., long. 8° 21' 3" E., surface, 

 Eebruary 4tli, &c. (night collection). 



Centropages violaceus was obtained in 11 tow-nettings, one of which was a surface 

 (night) gathei'ing, and the other 10 under-surface gatherings ; G of the under-surface 

 gatherings were day, and 4 were night collections, as shown by the formula : — 



r day collection. 

 r 1 surface 1 i uight ditto. 



Tow-nettmgsll<^ r ^ n n r 



1 10 under-surface/^ 'W collections. 



I 4 night ditto. 



Eour of the under-surface gatherings were from 10 fathoms, two from 15 fathoms, 

 one from 20 fathoms, two from 25 fathoms, and one from 50 fathoms. 



This Centropages was much rarer in the ' Buccaneer ' collections than the other 

 two species recorded in the ' Challenger ' collection. On the other hand, it was the more 

 common of the three species of Centropages observed by Dr. Brady. Centropages 

 violaceus differs from the other two species in having the postero-lateral angles of the 

 last thoracic segment rounded oflP instead of being produced into spinous processes. No 

 indication of colour could be detected in the ' Buccaneer ' sijecimens. Tliis was probably 

 due to their long immersion in spirit, which had extracted the colour characteristic of 

 the species. 



