COPEPODA. 
21 
of unequal length, the middle one very short, and distal to it, a comparatively long 
and slightly armed bristle, terminally four long and two shorter bristles. 
The maxillipede is armed with a strong claw bristle, denticulated on the inner 
margin, and the second basal has two comparatively stout bristles, the proximal of 
which is armed with wide-apart bristles. 
In the fourth pair of feet the apical bristle of the exopodite is longer than the third 
exopodite segment by one-third of its length. 
The agreement, therefore, between this species and Giesbrecht’s examples is very 
close, the only difference being one of size, and there is no doubt that the two species 
are identical. 
STEPHUS.* 
Mobianus, Giesbrecht, Fauna u. FI. Neap. NIX. (1892), p. 205. 
Stephos, Th. Scott, 10th Rep. Scotch Fishery Board, Yol. X. (1892), p. 215. 
Stephus = Stephos, Giesbrecht, ‘ Belgica’ Rep., p. 20. 
Steplios, Sars, “Crustacea of Norway,” Yol. IY. (1903), p. 61. 
Since Giesbrecht described the genus Mobianus, which was subsequently identified 
with Stephos (Scott), several other examples of the same genus have been described. 
Scott himself recorded three specimens, viz., S. minor, S. fultoni, and S. gyrans, 
supposing the latter to be identical with Giesbrecht’s Mobianus gyrans. 
Sars has described two new species from Norway, viz., S. lamellatus and 
Scotti, which latter is again identical with Stephos gyrans Scott (not Giesbrecht). 
Giesbrecht’s species ( gyrans ) is said by Sars to differ in the asymmetrical last thoracic 
segment and genital segment, the latter with “ a number of irregularly arranged 
spiniform processes not found in any of the northern species,” the last feet of the 
male also differing from S. scotti. 
The ‘ Belgica ’ report contains yet another species described by Giesbrecht as 
Antarctic, viz., S. longipes. This species recurs also in both the ‘ Gauss ’ and 
‘ Discovery ’ collections, and in the latter I find a further and considerably larger 
example, to which I have given the name antarcticum. 
As these descriptions are scattered over six different volumes, I think it may be 
of service to bring them together here. 
1. S. GYRANS. 
S. gyrans, Giesbrecht, Fauna u. FI. Neap. XIX. (1892), p. 205 ; Giesbrecht, u. Schmeil, Das Tierreich, 
Copep., p. 29. 
Furca longer than broad, anterior antennae reaching to end of genital segment, 
genital segment with a curved hook on ventral side, shorter hook on dorsal, fifth feet 
* The author, in agreement with Sars, prefers the name originally given to the genus by Scott, but it is 
perhaps better to observe the ordinary rule.—E d. 
