274 



Gen. 56. PlatyChelipUS Brady, 1880. 



Generic Characters. Body sub-cylindrical in form, resembling that in 

 Laophonte, all tbe segments being very sharply marked off from each other. Ce- 

 phalic segment of moderate size, and projecting in front in a triangular rostral 

 plate, not defined at the base. Urosome with the lateral expansions of the seg- 

 ments only slightly marked. Caudal rami of moderate size, with the apical seta? 

 comparatively short, the middle one very coarse, spiniform. Anterior antennse in 

 female 6-articulate, 2 of the joints belonging to the terminal part; those in male 

 very strongly hinged. Posterior antennte rather powerful, with the innermost 

 apical seta spiniform and coarsely denticulated, outer ramus very small. Oral 

 parts nearly as in Laophonte: posterior maxillipeds, however, less powerful, with 

 the dactylus very slender and clothed inside with thin spinules. 1st pair of legs 

 with both rami biarticulate, the outer one rather coarsely built, though shorter 

 than the inner, the latter far less fully developed than in Laophonte and less pro- 

 nouncedly prehensile, the apical -claw being very thin, almost setiform. Natatory 

 legs with the outer ramus strongly built, having the spines very coarse, whereas 

 the setse are much reduced, or in some cases wholly wanting, inner ramus poorly 

 developed ; those in male much larger than in female, with the outer ramus very 

 powerful, inner ramus of 3rd pair of legs transformed in a manner similar to that 

 in the male of Laophonte. Last pair of legs with the distal joint comparatively 

 short, lamelliform, inner expansion of proximal joint well developed; those in male 

 very much reduced. 



Remarks. This genus was established in the year 1880 by Prof. Brady, 

 to include a species, P. littoralis, found by him off the British coast. It was 

 referred by that author to his sub-family Nannopince, though in reality it only 

 exhibits a very remote affinity to the gen. Nannopus, on which this sub-family 

 was founded. In my opinion the present genus ought unquestionably to be included 

 in the family Laophontidas, exhibiting, as it does, all the chief features of that 

 family. Off the Norwegian coast, 2 well-defined species referable to this genus occur. 



181. Platychelipus littoralis, Brady. 



(PI. CXC & CXCl). 



Platychelipus littoralis, Brady, Monograph on British Copepoola, Vol. II, p. 103, PI. LXX1X, HITS. 



2023, PI. LXXX, figs. 1519. 



Specific Characters. Female. Body moderately slender, slightly tapering 

 behind, with well-marked constrictions between the segments. Cephalic segment 



