171 



Caudal rami also considerably more produced, being fully 3 times as long as 

 they are broad, and scarcely at all divergent; seta of outer edge rather slender, 

 and attached at a short distance from the end; apical setae well developed and 

 not very unequal. Anterior antennae, as in P. liber, rather robust, and clothed 

 with comparatively short and thick curved setae. Posterior antennae built on 

 the very same type as in that species, though having the distal part compara- 

 tively more slender. Oral parts and legs almost exactly as in P. liber. Ovisacs 

 comparatively large, extending considerably beyond the end of the tail. 



Male with the genital segment greatly inflated and terminating on 

 each side in an acuminate lappet. Posterior maxillipeds transformed in an 

 altogether similar manner to that in the male of P. liber. 



Body in both sexes of whitish colour, with a slight rosy or orange tinge. 



Length of adult female amounting to 1.85 mm., of male to 1.35 mm. 



Remarks. The above-described form is closely allied to P. liber, and 

 indeed at first I regarded it as only a variety of that species. On a closer 

 examination, however, I have found that it differs in some points so decidedly 

 as to be more properly considered specifically distinct. It is also of much larger 

 size, as is seen from the habitus-figures of both, which are drawn on the very 

 same scale. 



Occurrence. I have met with this form in 2 rather remote places on 

 the Norwegian coast, viz., in the outer part of the Romsdal Fjord, at some 

 distance from Molde, and in the inner part of Hardanger Fjord, at Sunde. In 

 both places it was found in considerable numbers clinging to the surface of 

 the beautiful deep-water Echinid, Echinus elegans, taken up from the great 

 depth of 150-200 fathoms. 



92. Pseudanthessius Sauvagei, Canu. 



(PI. XCVI). 

 Pseudanthessius Sauvagei, Canu, Copepodes de Boulonnais, p. 243, PI. XXV. 



Specific Characters. Female. Body comparatively short and stout, 

 with the anterior division sub-compressed, being greatly vaulted above and, 

 viewed dorsally, narrow oblong in outline, the greatest width scarcely exceeding- 

 half the length. Cephalic segment occupying almost -/.; of the length of the 

 anterior division, and exhibiting scarcely any trace of a subdivision. Last 

 trunk-segment very small. Tail not attaining half the length of the anterior 

 division, and almost perfectly cylindrical in form; genital segment scarcely at 

 all dilated, but rather long, occupying about half the length of the tail; anal 



