30 ME. T. SCOTT ON ENTOMOSTRACA 



EuCALANUS SETIGER, Brady. 



1883. Eucalanus sethjer, Brady, op. cit. p. 39, pi. iii. figs. 8-15. 



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

 January 10th (day collection). Off Accra, surface and 3 fathoms tow-nettings, January 16th 

 (day collection). Lat. 0° 45' 8" S., long. 7° 37' 4" E., surface tow-netting, Eehruary 2nd 

 (night collection). Bananah Creek, Congo River, surface tow-netting, February 7th (day 

 collection), &c. 



Eucalanus setiger was observed in 32 tow-nettings, 15 of which were surface and 17 

 under-surface gatherings. The under-surface tow-nettings were from various dej)ths, 

 ranging from 3 to 60 fathoms. Of the surface gatherings 10 of them were day, and 5 

 (including 1 close inshore) were night collections. Of the under-surface gatherings, 

 11 were day and 6 were night collections, as in the formula : — 



f 10 day collections. 



n. ,,. „r 15 surface -y 5 ^igi,t ditto. 



Tow-nettmgs 32-< ^ ,, ^ ,.^ 



1 17 under-surface | ^^ ^^^ '^^tto. 

 1 6 night ditto. 



By comparing this with other formula it will be observed that Eucalanus setiger 

 occurred in a proportionally greater number of day surface tow-nettings than do the 

 majority of the species recorded in this Report, the occurrence of which is frequent 

 enough to admit of comparison. This difference may only be due to accidental causes ; 

 nevertheless it seems of sufficient interest to be worth noting, as possibly indicating less 

 susceptibility to the influence of daylight or sunlight than those species which occur more 

 frequently in night than in day surface collections. 



Eucalanus setiger, like Eucalanus attenuatus, seems able to exist under very varied 

 conditions as regards the density and temperature of the Avater : it was obtained in the 

 open sea at Station 2 (50 fathoms), the density of the water being about 1*02020 and 

 temperature (corrected) 56°-85 E. ; at Station 23 (surface), density 1'02347 and temperature 

 82°-l E. ; and at Bananah Creek, where the density of the water was only 1"00870. This 

 may readily Ije distinguished from the other Eucalani of this Report by its smaller size 

 and by lateral setoe on the last two thoracic segments. 



Genus Rhincalanus, Dana (1852). 



Rhincalanus cornuttjs, Dana. 



1852. Rhincalanus cornutus, Dana, loc. cit. p. 1083, pi. Ixxvii. figs. 2a-d. 

 1883. Rhincalanus cornutus, Brady, op. cit. ]). 11, pi. vii. figs. 1-10. 



Eahitat. Station 3, 100 fathoms tow-netting, January 2nd (day collection). Station 9, 

 25 and 50 fathoms tow-nettings, January 10th (day collection). Station 14, 10 and 20 

 fathoms, January 21st (night collection). Lat. 1° 55' 5" N., long. 5° 55' 55" E., 30, 60, 

 260, 360, and 460 fathoms tow-nettings, January 22nd (day collections). Station 23, 

 surface, and 10, 20, 85, 135, 185, and 235 fathoms tow-nettings, Eehruary 5th (day 

 collections), &c. 



