FEOM THE GULF OF GUINEA. 25 



temperature 82°'2 P., and at Bananali Creek, where the sp. gr. of the water was 1-00870 

 and the temperature 82° F. It was also captured at a depth of 260 fathoms (as recorded 

 above), where the temperature of the water was about 16° F. This species is thus 

 apparently able to exist under very varied conditions, as regards the density and tem- 

 perature of the water. It also appeared to be generally distributed throughout the area 

 examined, but was more plentiful near, and south of, the Equator. The flexed position 

 of the right fifth foot of the male, referred to by Dr. Brady in his Eeport on the 

 ' Challenger ' Copepoda, was also observed in many of ' Buccaneer ' specimens. 



Calanus peopinqtjus, Brady. 



1883. Calanus propinquus, Brady, op. cit. p. 34, pi. ii. figs. 1-7, pi. xiv. figs. 10, 11. 



Habitat. Lat. 1° 55' 5" N., long. 5° 55' 5" E., 360 fathoms, day collection, January 

 22nd. Station 23, surface and 235 fathoms, day collections, February 5th. 



This species, though only satisfactorily identified in tow-nettings from the localities 

 described, may have occurred in others. Usually I was unable to identify this Calanus 

 with certainty, except by carefully dissecting the specimens ; hence the probability of its 

 being of more frequent occurrence in the collection than the few localities given for it 

 would seem to indicate. 



Calanus tonsus, Brady. 



1883. Calanus tonsus, Brady, op. cit. p. S-i, pi. iv. figs. 8, 9. 

 Eahltat. In a tow-netting from Station 23, a surface gathering. 



The large and tumid first abdominal segment seems to be a fairly good character 

 of this species. 



Calanus gracilis, Dana. 



1852. Calanus gracilis, Dana, Crust. U.S. Expl. Exped. p. 1078, pi. Ixxiv. fig. 10. 

 1883. Calanus gracilis, Brady, op. cit. p. 35, pi. v. figs. 1-6, and pi. xlvi. fig. 1. 



Habitat. Station 2, 5 fathoms, night tow-netting, January 1st. Station 3, 25 fathoms, 

 January 2nd (day collection). Lat. 3° 22' 5" N., long. 4° 11' 8" E., 30 fathoms, January 

 20th (night collection). Station 21, surface, February 3rd (day collection). Station 23, 

 surface and 235 fathoms (the first a day, the other a night collection). 



Calanus gracilis was obtained in 19 tow-nettings — 4 of these were surface gatherings and 

 15 were under-surface gatherings. 2 of the surface and 12 of the under-surface tow- 

 nettings were day collections, while 2 of the surface and 4 of the under-surface were 

 night collections, as in the formula : — 



2 day collections. 



1. 



..• -,n( ^^'^'^^"^ I 2 night ditto. 



Tow-nettmgs 19 -^ ^-.^i ,-.. 



( 15 under-surface | ^^ day ditto. 

 l 4 night ditto. 

 The under-surface tow-nettings ranged from 5 to 160 fathoms. Though frequent in a 

 few of the gatherings in which it occurred, Calanus gracilis was not a common species, 



SECOND SERIES. — ZOOLOGY, VOL. VI. 4 



