140 



areolae found in that species inside the anterior edge of the left valve. It is 

 also very different from the next species, which Dr. Aim suppose to be the same. 



Occurrence. Only a few specimens of this form have as yet come under 

 my notice. They were taken, many years ago, from a grassy pond near 

 Christiania. 



Distribution. Sweden (Aim). 



60. Pionocypris picta (Strauss). 



(Pt. LXV. fig. 2). 



Cypris picta, Strauss, Mem. du Mus. d'Hist. Nat., Vol. VII, p. 59, PI. 1, figs. 1719. 

 Syn: Cypridopsis picta, G. O. Sars. 



Specific Characters. Female. Shell rather tumid, seen laterally, short 

 ovoid in shape, greatest height behind the middle and about equalling 3 /V> of 

 the length, dorsal margin boldly arched behind the middle and sloping rather 

 steeply behind, more slowly in front, ventral margin very slightly sinuated, 

 anterior extremity obliquely rounded, posterior broader and obtuse at the lower 

 corner; seen dorsally, broadly ovate in outline, with the greatest width behind 

 the middle and about equal to the height, anterior extremity gradually nar- 

 rowed to an obtuse point, posterior broadly rounded off. Valves smooth and 

 rather densely hairy. Caudal rami with the stem comparatively short, scarcely 

 half the length of the flagellum. 



Colour of shell light bluish green, with a rather conspicuous dark patch 

 on each side arching over the muscular spots, and continued down the valves 

 both in front and behind, extremities of valves tinged with a similar dark hue. 



Length of adult female 0.43 mm. 



Male unknown. 



Remarks. This small Ostracod was recorded as early as the year 1821 

 by Strauss, and has subsequently also been noted by some other authors on 

 the continent, though not observed either in Sweden or on the British Isles. 

 Besides by its small size, it is easily recognised form the other species of the 

 present genus by the shape of the shell and its peculiar colour. 



Occurrence. I have taken this form occasionally in grassy ponds and 

 swamps near Christiania. The animals are rather activ, swimming about in 

 the water with considerable speed. 



Distribution. France, Holland, Belgium, 



