79 



18. Candona rostrata, Brady & Norman. 



(PI. XXXVII). 



Candona rostrata, Brady & Norman, Monograph of the marine and fresh-water Ostracoda of the 

 North western Europe, 1889, p. 101, PI. IX, figs. 11 & 12, PI. XII, figs. 2231. 

 Syn: Candona limbata. G. O. Sars 



, , marchica, G. W. Miiller (part) 



Specific Characters. Female. Shell somewhat compressed, seen laterally, 

 angularly subreniform in outline, greatest height far behind and only slightly 

 exceeding half the length, dorsal margin straight in the middle and somewhat 

 ascending, with a slight trace of angle both in front and behind, ventral margin 

 rather deeply sinuated, anterior extremity bluntly rounded or almost transversely 

 truncated, posterior much higher and broadly rounded off, forming below a 

 rather conspicuous bowed expansion; seen dorsally, oblong oval in outline, 

 with the greatest width about equal to 2 /s of the length, anterior extremity 

 remarkably contracted at the end, forming, as it were, a sharp rostriform 

 prominence, posterior obtusely pointed. Valves somewhat unequal, the left one 

 overlapping the right slightly both in front and behind, hyaline borders at 

 each extremity very broad and conspicuous, surface of a somewhat dull ap- 

 pearance and all over densely hairy, the hairs being however less coarse than 

 in the preceding species. Antennae moderately slender, resembling in structure 

 those in that species. Posterior legs likewise of a very similar appearance. 

 Caudal rami somewhat more attenuated, with the apical claws comparatively 

 shorter. Genital lobes simply rounded behind. 



Male, as a rule, somewhat larger than female, and having the posterior 

 part of the shell rather more expanded. Prehensile palps of maxillipeds conspi- 

 cuously unequal, the right one being much broader than the left and conside- 

 rably bowed outside. Caudal rami still more attenuated than in female, with 

 the apical claws less curved. Copulative appendages resembling in structure 

 those in C. Sarsi, but having the upper terminal lappet smaller and simply 

 rounded. 



Colour in both sexes whitish, semipellucid, wit a more or less distinct 

 orange tinge. 



Length of adult female amounting to 1.10 mm., of male to 1.20 mm. 



Remarks. This form was described in the year 1889 by Brady and 

 Norman from some male specimens, the female sex not being observed. It is 

 evidently nearly allied to the preceding species, but may readily be distinguished 

 by the somewhat different shape of the shell and its less coarse hairy clothing, 

 as also by the very broad and conspicuous hyaline borders at each extremity. 



