131 



maxillae coarsely denticulated. Apical claw of anterior legs very slender and 

 elongated. Caudal rami almost straight and slightly attenuated, with the dorsal 

 edge very finely spinulose, apical claws rather slender and not much unequal, 

 the distal one about half the length of the ramus, dorsal bristle more than 

 twice as long as the apical one. 



Colour pale yellow with an olivaceous tinge and clouded with irregular 

 bluish green shadows. 



Length of adult female amounting to 2.50 mm. 



Male unknown. 



Remarks. This form has by some authors been identified with Cypris 

 strigata of O. Fr. Miiller; but this identification is certainly wrong, and is 

 also decidedly rejected by the most recant author, Dr. Aim. On the other 

 hand no doubt can arise on the identity of Cypris lutaria of Koch with the 

 present species, and as the specific name proposed by that author is of earlier 

 date than either Jurini or Liicida, it ought of course to be retained for the 

 present form. As to its systematic position, it has generally by recent authors 

 been placed in the genus Eticypris Vavra. But this cannot by any means be 

 admitted, as it differs very essentially from the species of that genus in the 

 rudimentary condition of the natatory setae on the posterior antennae and the 

 consequent absolute want of swimming power. Nor can it, as done by Brady 

 and Norman, be referred to the genus Herpetocypris, as the structure of the 

 shell is very different. On the other hand I do not find any objection for 

 including it in the genus Prionocypris, as here defined. It is one of our 

 largest fresh water Ostracoda, and moreover easily recognizable by the general 

 form of the shell and its colour. 



Occurrence. I have taken this handsome Ostracod, early in the summer, 

 rather abundantly in some ditches with grassy bottom near Christiania (Ule- 

 vold). The animals were found constantly keeping at the bottom, they being 

 quite unable to move freely in the water. 



Distribution.- -Throughout Europe, Central Asia. 



52. Prionocypris glacialis, G. O. Sars. 



(PI. LXI, fig. 1). 

 Herpetocypris glacialis, G. O. Sars, Oversigt af Norges Crustaceer II, p. 61. 



Syn: Cypris Jurini, G. O. Sars (non Zaddacli). 

 Emypris glacialis, Aim. 



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

 oval in shape, greatest height in front of the middle and exceeding somewhat 



