FROM CHRISTMAS ISLAXD. 289 



but I have )ieeii unal)le to distinguish between them or to 

 separate them satisfactorily from C. elongatas S • They can be 

 readily picked out under a dissecting microscope, owing to the 

 fact that, apart from differences of form, the maxillipedes are 

 coloured a rusty- red. 



Distribution. Tropical Pacific. 



CoKYOiEus FLACcus Giesbrecht. 



There is nothing to add to Giesbrecht's (10) figures and de- 

 sciiption of this species, which is easily separated from (J. alatus, 

 tlie only species which it at all resembles, by the form of the 

 abdomen and furca. There occurred twelve specimens, females, 

 in three gatherings. 



The other two species of this group, G. elongatas and G. lirn- 

 hatus^ which Dahl (5) regards as distinct, were not found in the 

 collection. 



Distrihation. Mediterranean, Indian Ocean, Tropical Pacific. 



CoRYC'.Eus ROBUSTUS Giesbrecht. 



G. venastns Brady (1). 



G. rohustus Giesbrecht (10). 



Present in three gatherings, 10 males and 2 females. 



The female is i-ecognisable by its very lai-ge size and by the 

 form of the genital segment, which is provided with lateiul ridges 

 and overlaps the anal segment in dorsal view. 



There can be no doubt that the species which Brady (1) re- 

 corded as G. venustus Dana was in reality G. robustios. The 

 detailed figure of the abdomen shows the genital segment over- 

 lapping the anal, in a way wliich is characteristic of that species 

 alone. The figure (pi. liv. fig. 8) of the whole animal is 

 somewhat misleading, as the artist or engraver evidently, after 

 the picture was finished, mistook the lateral abdominal ridges 

 for egg-sacs, and touched them up with a view to increasing the 

 i-esemblance. Anyone who compares Giesbrecht's figui-e of 

 G. rohiostus $ (11) (pi. li. fig. 38) with Brady's figure of G. ven- 

 ■astus (1) (pi. liv. fig. 8) can hardly avoid the conclusion that 

 both had the same species before them. The dimensions given 

 by each are identical. Brady's description does not mention any 

 characters of specific value. Giesbrecht's suggestion that Brady's 

 G. venustiis was really G. ohtusus seems to me to be quite i)aseless. 



Distrihation. Red .Sea, Arabian .Sea, Indian Ocean, Tropical 

 Pacific, and off Cape of Good Hope. 



CoRYC.EUS SPECiosus Dana. 



An easily recognised species, well represented in tlie collection. 



It occurred in six gatherings, 22 females and 33 males. 



Distrihution. Mediterranean, Pted Sea, Arabian Sea, Indian 

 Ocean, Tropical Pacific, ofl:" Cape of Good Hope, Tropical and 

 North Atlantic. 



