139 



Colour of the shell cinereous green, with a dark shadow dorsally, behind 

 the ocular region. 



Length of adult female 0.76 mm. 



Male unknown. 



Remarks. The above-described form is unquestionably identical with 

 Cypridopsella elongata of Kaufmann, agreeing pretty well with the figures 

 given by that author. It ought in my opinion to be referred to the genus 

 Piortocypris, in spite of the somewhat anomale shape of the shell. A character 

 very distinctive of the present species, but overlooked by Kaufmann, is the 

 peculiar thickenings occurring inside the anterior edge of the left valve. 



Occurrence. I have only met with this form in a single place of our 

 country, viz., in a grassy pond at Asker, West of Christiania; but I have, many 

 years ago, raised the same species rather plentifully from dried mud taken in 

 Algeria and kindly forwarded to me by Mr. Chevreux. 



Distribution. Switzerland, Germany, Algeria. 



59. Pionocypris Almi, G. O. Sars, n. sp. 



(PI. LXV, fig. 1). 



Cypridopsis elongata, Aim, Monographic der Schwedischen Siisswasser Ostracoden, p. 79 



(not Kaufmann). 



Specific Characters, Female. Shell less elongated than in the preceding 

 species, seen laterally, ovoid in shape; with the greatest height in the middle 

 and considerably exceeding half the length, dorsal margin boldly and rather 

 evenly arched throughout, ventral margin slightly sinuated in the middle and 

 scarcely bowed in the oral region, anterior extremity obliquely rounded, 

 posterior a little broader and obtusely blunted at the lower corner; seen 

 dorsally, ovate in outline, with the greatest width in the middle and about 

 equalling 3 /5 of the length, anterior extremity obtusely pointed, posterior rounded 

 off at the end. Surface of shell smooth and finely hairy; left valve without 

 any traces of .the marginal areolae in front, found in the preceding species. 

 Vibratory plate of maxillipeds with 2 setae. Caudal rami of the usual shape. 



Colour of shell uniformly light greenish, without any obvious dark patches. 



Length of adult female 0.59 mm. 



Male unknown. 



Remarks. This form has been erroneously identified by Aim with the 

 preceding species, from which it differs decidedly in the far less elongated 

 form of the shell, as also in she absolute absence of the peculiar marginal 



