266 EEPORT— 1902. 



UndeuchcBta and Chirundina have not yet been met with in northern 

 waters, and Chiridms 2)oppei appears to be exclusively a Mediterranean 

 species. Pseudcetideus, Gaidius, Gaetanus, Euchirella appear not to 

 approach the coasts, the only genera which do so being, apparently, 

 ^tidetis and Bradyidius. 



The scheme which follows is the merest outline, and will be more fully 

 elaborated subsequently in a monograph dealing with the Copepoda of the 

 Faroe Channel. 



A. Head with a two-pointed rostrum. ' 



I. First joint of exopodite of the first foot without external spines. 



1. Last thoracic segment produced into strong spines. Rami of 



mandible and posterior antennse nearly equal. Basal joints of 

 posterior foot-jaw equal and endopodite two-thirds as long. 

 Endopodite of first foot one-jointed ; of second foot one or 

 two jointed ; bristles of first basal of fourth foot simple 

 =genus ^Etideus (Brady). 

 Three species — jEt. armatus, Gbt., ^t. ienuirostris (n. sp.), 

 uEt. hradyi (Brady). 



II. First joint of exopodite of first foot tvith an external spine; 



thoracic spines on last segment. 



2. Outer rami of posterior antenna? and mandible longer than 



inner ; second basal of posterior foot-jaw longer than the 

 first, endopodite only one-half to one-third as long as the 

 second basal. Inner ramus of first foot one-jointed, of second 

 two-jointed. Bristle of basal of fourth foot simple=genu3 

 Pseudcetide7is, nov. gen. 

 Two species— /"sertc^. armatus (Chiridius armatus, Sars), Pseud, 

 multiserrata, n. sp. 



3. Anterior antennie with thick basal joints, tapering distally, 



twenty-four-jointed, and densely clothed with long cross- 

 ringed bristles. Endopodite of posterior foot-jaw little more 

 than half as long as the second basal=:genus Bradyidius, 

 Gbt. 

 Two species — B. armatus, Gbt. (Undinopsis hradyi, Sars), B. 

 similis (JJnd. similis, Sars). 



B. Head with a short one-2winted rostrum. 



I. Last thoracic segments produced into spines or angular processes. 



4. Outer rami of posterior antennse and mandible longer than inner, 



second basal of posterior foot-jaw three to four times as long 

 as endopodite, outer ramus of first foot of only two or of 

 three segments ; inner rami of second foot one or two jointed, 

 first basal of fourth foot with bristles replaced by tubal 

 processes = genus Gaidius, Gbt. 

 Two species — G. pungens Gbt., G. horeale (n. sp.) {Chiridius 

 tenuispinus, Sars). 



5. Head with characteristic dorsal spine ; other characters like 



Gaidius = genus Gaetanus, Gbt. 

 Two species — 6. armiger, Gbt., G. miles, Gbt. 



■ The species diagnosis is omitted in this Eeport. 



