39 



Antennae and legs built on the very same type as in Notodelphys. Oral parts 

 however (in male) considerably reduced, so as not to be adapted for mastication. 

 Anterior lip transformed to a somewhat tubular prominence containing the 

 outer part of the gullet. Mandibles with the palp normally developed, biramous, 

 masticatory part however reduced to a short simple point. Maxillae with the 

 masticatory lobe likewise much reduced, but having the other parts distinctly 

 defined. Anterior maxillipeds without any setiferous lobes inside, and termi- 

 nating in a single straight spine. Posterior maxillipeds extremely small and 

 rudimentary. 



Remarks. The exact limits of this genus cannot at present be stated, as 

 only the male sex is as yet known. It is very likely to believe that the female 

 will be found to exhibit several essential differences from the male, and it is 

 even not improbable that the structure of the oral parts, upon which the 

 present genus has chiefly been founded, will turn out to be rather different 

 in the female sex. Canu placed this genus, on account of the reduced oral 

 parts, next to the genus Enterocola. It is however otherwise very different 

 from that genus, and evidently so closely related to Notodelphys, that in any 

 case it ought to be included in the same family with it. Two different species 

 of this genus have been recorded by Canu, both of them only observed in the 

 male sex. The one of these species also occurs on the Norwegian coast, and 

 will be described below. 



8. Agnathaner typicus, Canu. 



(PI. IX). 

 Agnathaner typicus. Canu, Copepodes du Boulonnais, p. 211, PI. XVII, figs. 1 10. 



Specific Characters. Male. Body rather slender, with the anterior division 

 conspicuously dilated in the middle. Cephalic segment comparatively large, 

 occupying more than half the length of the anterior division, and gradually 

 somewhat contracted anteriorly, frontal part narrowly truncated and produced 

 below to a recurved rostrum. The 3 succeeding segments gradually diminishing 

 in size, and having the epimeral plates somewhat exstant and separated by 

 deep lateral incisions. Last truncal segment very small, with the lateral parts 

 not expanded. Tail rather slender, almost attaining half the length of the 

 anterior division, with the segments gradually diminishing in size behind; 1st 

 segment somewhat swollen, to receive the 2 usual spermatophores. Caudal 

 rami narrow linear in shape and not at all divergent, exceeding somewhat in 

 length the anal segment, and about 3 times as long as they are broad; apical 



