FROM THE GULF OF GUINEA. 109 



(Nov. 30, 1891), he discusses somewhat fully the classification of the species now under 

 consideration, as well as that of its allied forms, and also the various opinions expressed 

 by different writers bearing on tlie same question. In this paper Prof. Clans shows, more 

 or less conclusively, that Sai^phir rosti^atus, L. Car., is synonymous with Goniopsyllus 

 rostratus, Brady, and also that Chjtemnestra Uendorffi, Poppe, is equivalent to Goniopelte 

 gracilis, Claus. In a concluding uote, referring to the likelihood that Goniopelte may 

 be synonymous with Goniopsyllus, he says : " But if it is desirable, — which I could not 

 advise, taking into account the different points, — that the two forms Goniojjelte and 

 Goniopsyllus should be made only different species of the same genus, Clytemnestra, for 

 reasons given in my work on Copepods, would not be valid as a generic name. It 

 must in that case be Goniopsyllus, Bi'ady." With all deference, however, to W'hat 

 Prof. Claus has stated, I prefer meantime to restore Dana's generic name, Chjtem- 

 nestra ; for, though his description be imperfect, there need be no uncertainty as to his 

 figures. 



{Note. — The jireccding remarks on Chjtemnestra were written at the close of 1891, and 

 long before I saw Giesbrecht's Monograph of the Neapolitan Copejjoda.) 



Genus Setella, Dana. 

 Setella, Dana, Crust. U.S. Expl. Exped. 1852. 



Setella gracilis, Dana. 



1852. Setella gracilis, Dana, Crust. U.S. Expl. Exped. p. 1198, pi. Ixxxv. figs. 3 a, g. 

 1883. Setella gracilis, Brady, Report Chall. Copep. p. 108, pi. 1. figs. 1-10. 



Habitat. — Station 2, 5 fathoms, January 1st (night collection). Station 9, 50 fathoms, 

 January 10th (night collection). Lat. 1° 55' 5" N., long. 5° 55' 5" E., 460 fathoms, 

 January 22nd (day collection). Station 18, surface, Pebruary 3rd (day collection). 

 Lat. 6" 47' 5" S., long. 11" 30' 6" E., surface, February 8th (day collection), etc. 



Setella gracilis was obtained in 85 tow-nettings, 31 of which were surface and 51 

 under-surface gatherings. The under-surface gatherings were from various depths, from 

 2-| to 460 fathoms. 11 of the surface and 34 of the under-surface tow-nettings were 

 collected during the day, and 23 of the surface and 17 under-surface w^ere night collec- 

 tions, as shown by the formula : — 



11 day collections. 

 34 surface 



{. 



... n^ , l23 nisht ditto. 



Tow-nettmgs 8o ^ r o . i ' t 



( 51 under-surface | 3* "'^^ ^^i^*"- 



1 17 night ditto. 



A considerable proportion of the specimens carried ovisacs. The size of the specimens 

 varied sufficiently to lead me to think that there were more than one species of Setella 

 in the collection ; but careful dissection showed little, if any, structural diflPerence 

 among the specimens, and any structural difference observed was easily accounted for by 

 difference in maturity or sex. 



