_146 



the desirability of transferring them to a particular genus or subgenus, for 

 which he proposed the name Platycheiron, referring to the broad and flattened 

 form of the propodos in the male posterior maxillipeds. This name cannot 

 however be accepted, as it is of much more recent date than that proposed 

 by Boeck. 



77. Hemicyclops purpureus, Boeck. 



(PI. LXXXI). 

 Hemicyclops purpureus, Boeck, Nye Slxgter og Artcr nv Saltv;indscopcpodcr, Chr. Vid. Sclsk. 



Forhandl. f. 1872, p. 42. 

 Syn : Lichomolgns litto rails, Scott. 



Specific Characters. Female. Body moderately slender, with the 

 anterior division rather broad, oval in outline, and pronouncedly applanated. 

 Cephalic segment fully as long as the 4 succeeding segments combined and 

 narrowly rounded in front; rostral prominence incurved and obtuse at the tip. 

 Epimeral plates of the 3 succeeding segments expanded laterally and closely 

 imbricate; those of the 4th segment scarcely smaller than the others. Last 

 trunk-segment abruptly much smaller than the preceding ones, and not much 

 broader than the genital segment. Tail rather slender, equalling in length 

 about -/a of the anterior division, and sub-cylindric in form; genital segment 

 about as long as the 3 succeeding segments combined, and only very slightly 

 dilated in front; anal segment rather small. Caudal rami comparatively short, 

 though a little longer than they are broad at the base, and slightly narrowed 

 distally; seta of outer edge small and attached near the end; apical setae rather 

 unequal, the inner mediate one being, as usual, the longest, and almost 

 attaining the length of the tail, seta of outer corner scarcely half as long as 

 that of the inner. Anterior antennae about equal in length to the cephalic 

 segment, and gradually attenuated distally, being somewhat abruptly bent at 

 the base, 2nd and 4th joints the longest. Posterior antennae well developed, 

 penultimate joint almost as long as the preceding one and ciliated along the 

 anterior edge, distal corner scarcely produced and provided with a strong 

 curved seta and 2 bristles, one of which is ciliated; terminal joint much 

 shorter than the penultimate one and almost quadrangular in form, carrying 

 on the tip 4 strong curved setae accompanied by a few short bristles. Anterior 

 maxillipeds with 2 coarse setae at the end of the proximal joint inside and 2 

 others on the distal joint, apical spines very strong, claw-like, the outer one 

 armed in the middle with a well-marked denticle. Posterior maxillipeds rather 

 fully developed, with the middle joint angularly produced inside, and, like the 



