21 



uf unequal leoglh, tin- middle one very short, and distal to it, a comparatively lung 

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



The m.ixillijMjdo is armed with a strong claw bristle, denticulated on the inner 

 margin, anil tin* -.mul basal has two comparatively stout bristles, the proxinuil of 

 which is armed with wide-apart bristles. 



In tin- fourth pair of feet the apical bristle of the exopoditc is longer than the third 

 exopodite segment by one-third of its length. 



The aj-rrrineiit. therefore, between this species and Giesbrecht's examples is very 

 clan, the only diftnooa being one of size, and there is no doubt that the two species 

 are identical. 



STEPHUS.* 



JOKmiu, Givbrecht, Fauna n. Fl. Neap. XIX. (1892), p. 205. 



ftp* ii, Th. Scott, 10th Rep. Scotch Fwhery Board, Vol. X. (1892), p. 245. 



Sttpko*, Giesbrecht, ' Belgica ' Rep., p. 20. 

 Ban, " Crustacea of Norway," Vol. IV. (1903), p. 61. 



Since Giesbrecht described the genus ifobianus, which was subsequently identified 

 with Stfphos (Scott), several other examples of the same genus have been desmU-d. 

 Scott himself recorded three specimens, viz., S. minor, S. fultoni, and S. yyranx, 

 supposing the latter to be identical with Giesbrecht's Mobianus yyrans. 



Bun has described two new species from Norway, viz., S. lamellatux and 

 Scotti, which latter is again identical with Stephos gyrans Scott (not Giesbrecht). 

 Giesbrecht's species (gyransi) is said by Sars to differ in the asymmetrical last thoracic 

 segment and genital segment, the latter with " a number of irregularly arranged 

 Hpiniform 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 dcscrilicd* by Giesbrecht as 

 Antarctic, vi:., 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. 



At these descriptions are scattered over six different volumes, I think it may be 

 of service to bring them together here. 



1. S. GYRANS. 



S. ffyraiu, Gieabrecht, Fauna n. Fl. Neap. XIX. (1892), p. 205 ; Giesbrecht, a. Schmeil, DM Tiem-ich. 

 Copep., p. 29. 



Furca longer than broad, anterior antcnute 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 Ban, prefer* the name originally given to the scout by Scott, bat it ii 

 perhaps better to observe the ordinary rule. ED. 



M 2 



