102 



43. Eurytemora hirundoides (Nordqvist). 



(PI. LX1X). 



Tenunrlla (i/'/itii.^ var. tii>-nit(hi<h-i<, Nordqvist. Die Calaniden Finlamls, p. 48, PI. IV. 



figs. 511; PI. V, tig. 5. 



Syn: Tcmora velox, Lilljeborg cf. 

 Tcmora inermis, Boeck (immature). 



tfjuvific Characters. Female. Body exceedingly slender, with the ante- 

 rior division, seen dorsally, narrow oblong in form, greatest width about 

 equalling Vs of the length, and occurring somewhat in front of the middle, 

 anterior extremity narrowly rounded, posterior slightly contracted. Cephalosome 

 somewhat exceeding in length the 3 succeeding segments combined, and exhibiting a 

 well-marked dorsal prominence behind. Last segment ofmetasome with the lateral 

 parts expanded into triangular, somewhat divergent lamella 1 , which, however, 

 do not extend as far as the genital segment. The latter somewhat dilated in 

 the middle, and abruptly contracted behind. Anal segment fully as long as the 

 genital segment, and clothed dorsally with delicate spikes. Caudal rami very 

 slender and elongated, somewhat exceeding in length the last 2 caudal segments 

 combined, and, like the anal segment, clothed dorsally with delicate spikes, apical 

 setae comparatively more elongated than in E. celo.r, that of the outer edge situated 

 at rather a long distance from the others. Anterior antenna 1 , when reflexed, 

 reaching scarcely to the end of the anterior division. Natatory legs considerably 

 more slender than in E. velox, otherwise of same structure. Last pair of le^s 

 with the penultimate joint armed outside with 2 slender spines, unguiform process 

 comparatively larger than in E. velox, and quite smooth, extending obliquely 

 backwards. Ovisac large, oblong oval in form. 



Male still more slender than female, and, as usual, having the last seg- 

 ment of metasonie simple, not expanded laterally. Right anterior antenna with 

 the middle section considerably tumefied. Last pair of legs with the 2nd joint 

 on both sides conspicuously dilated, exhibiting inside a rounded expansion, terminal 

 joint without any median subdivision, that of right leg conspicuously dilated 

 at the base, that of left leg terminating in 3 lobules with a hollow space 

 between them. 



Culonr. Body in both sexes highly pellucid and almost colourless. 



Length of adult female reaching to 1.15 mm. 



Remarks. This form has generally been considered as only a variety ot 

 E. affinis, Poppe. In my opinion, however, it ought to be specifically distinguished 

 with fully as much reason as the 3 forms, E. hirundo, Giesbrecht, E. lacttstri*. 

 Poppe, and E. gracilis, G. 0. Sars. All the 4 species are certainly very closely 



