over in recent times several additional species, closely agreeing with the type of 

 the present genus, and exhibiting the very same differences from Cyprinolus, 

 have been detected. To the Norwegian Fauna only belongs a single species, 

 to be described below. 



48. Heterocypris incongruens (Ramdohr). 



(PI. LVII). 



Cypris incongruens, Ramdohr, Magazin. naturf. Fretinde in Berlin, 2 Jahrg. 1808, p. 86, 



PI. Ill, figs. 112, 15-20. 

 Syn: Monoculus aurantins, Jurine. 



Cypris fttsca, Strauss. 

 ,, Cyprinotus incongruens, G. O. Sars. 

 Eucypris incongruens, Daday. 



Specific Characters. Female. Shell, seen laterally, oval subreniform in 

 shape, distinctly higher behind than in front, greatest height not fully attaining 

 2 /3 of the length, dorsal margin sloping gradually in front and quite evenly 

 arched behind, ventral margin very slightly sinuated in front of the middle, 

 anterior extremity somewhat obliquely rounded, posterior obtuse, with the lower 

 corner not at all produced; seen dorsally, oblong-ovate in outline, with the 

 greatest width behind the middle and about equal to half the length, anterior 

 extremity gradually narrowed to an acute point slightly turned to left side, 

 posterior obtuse. Surface of shell smooth and polished, with scattered small 

 puncta and clothed with short and delicate hairs; left valve overlapping the 

 right in front by a well-marked pellucid border wanting on the right valve, 

 marginal tubercles of the latter obtusely rounded and in some cases not easy 

 to discern, though apparently never wholly absent. Anterior antennae with the 

 terminal part about the length of the basal one, its 1st joint fully as long as 

 the 2 succeeding ones combined. Posterior antennae with the penultimate 

 joint much shorter than the preceding one, natatory setae extending somewhat 

 beyond the tips of the apical claws. Caudal rami rather narrow and nearly 

 straight, distal claw about half the length of the ramus, dorsal seta rather 

 longer than the apical one. 



Colour pale yellow, in older specimens passing over to an orange hue, 

 ripe ova shining through the shell with a brick-red colour. 



Length of adult female amounting to 1.60 mm. 



? Male unknown. 



Remarks. This form was recorded as early as the year 1808 by Ram- 

 dohr, and has subsequently been observed by almost every one of the authors 

 who have studied the fresh water Ostracoda, though described under several 



