obtained during the Cruise of the ‘ Oceana.’ 15 
Calanus finmarchicus, Gunner. 
1765. Monoculus finmarchicus, Gunner, Skr. Kjébenh. Selsk. vol. x. 
p. 175, figs. 20-23. 
This, probably the most abundant and widely distributed 
of all known Copepoda, occurred in twenty-five of the forty 
stations and at all depths from the surface to 1710 fathoms. 
Calanus cristatus, Kroyer. 
1848. Calanus cristatus, Kroyer, Naturh. Tidsskr. n. ser. vol. ii. pp. 547, 
553, 607. . 
Three specimens only of this little-known species occurred 
in three separate gatherings at depths from 560 to 1510 
fathoms. All appeared to be immature females, which, as 
Giesbrecht points out, is the only form known. 
Calanus gracilis, Dana. 
1849. Calanus gracilis, Dana, P. Amer. Ac. vol. ii. pp. 18, 24. 
Its long graceful antenne easily distinguish this species 
from all other Calani. It was sparingly found at six stations 
at depths of from 270 to 13800 fathoms. 
Calanus tenuicornis, Dana. 
1849. Calanus tenuicornis, Dana, op. cit. vol. ii. p. 15. 
One specimen was found at 6” Station at a depth of 610 
fathoms, and two others at greater depth, the latter in an 
immature state. 
Eucalanus elongatus, Dana. 
1849, Calanus (part.), Dana, op. cit. vol. ii. p. 10. 
This large and easily recognized species occurred at seven 
stations at from 560 to 1710 fathoms. 
Eucalanus attenuatus, Dana. 
1849. Calanus attenuatus, Dana, op. cit. vol. ii. p. 18. 
Similar in appearance to LE. elongatus, but readily distin- 
guishable from the latter by its three-jointed abdomen, that 
species having four joints. It occurred at fifteen stations, 
only two of them, however, being those where HH. elongatus 
was found, although at similar depths—920 to 1710 fathoms. 
