COPEPODA. 21 



of unequal length, the middle uue very -short, and distal to it, a comparatively luug 

 and slightly armed bristle, terminally four long and two shorter bristles. 



The maxillipede is armed with a strong claw bristle, denticulated ou 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 

 cxopodite 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.* 



Mobiamis, Giesbrecht, P'auna u. Fl. Nc;ip. XIX. (18'.i2), p. 205. 



Stephos, Th. Scott, 10th Rep. Scotch Fishery Board, Vol. X. (1892), p. 24.5. 



Stfphus = Stqihos, Giesbrecht, ' Belgica' Rep., p. 20. 



Stephos, Sars, " Crustacea of Norway," Vol. IV. (190:!), p. Gl. 



Since Giesbrecht described the genus 3[obiaiuis, which was subsecjuently identified 

 with Sfi'phos (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 Mohianus 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 differino' 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 brinw them tooether here. 



o o 



1. S. GYRANS. 



S. gijrans, Giesbrecht, Fauna u. Fl. Neap. XIX. (1892), p. 205; Giesbrecht, u. Schmeil, Das Tierreicb, 

 Copep., p. 29. 



Furca longer than broad, anterior antennae reaching to end of genital segmenj;, 

 genital segment with a curved hook on ventral side, shorter hook on dorsal, fifth feet 



* Tlic 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, — Ed. 



M 2 



