130 



Gen. 25. Pnonocypris, Brady & Norman, 1896. 



Generic Characters. Shell of somewhat varying shape in the different 

 species but as a rule higher in front than behind. Valves subequal, with the 

 edges in some cases serrate, though more generally smooth ; inner duplicatures 

 of moderate size, broader in front than behind. Antennae not adapted for 

 swimming, the natatory setae of the posterior ones being quite rudimentary. 

 Maxillae with the masticatory lobes not much produced, palp narrow, with the 

 distal joint comparatively small and scarcely widening at the end. Legs rather 

 slender. Caudal rami of moderate size, with the apical claws less unequal 

 than in Herpetocypris, dorsal bristle somewhat remote from the apex, apicale 

 one very minute. 



Remarks. This genus was proposed in the year 1896 by Brady and 

 Norman, and only founded on a single species, P. serrata, the generic name 

 alluding to the serrated edges of the valves in that species. The genus was 

 subsequently admitted by Kaufmann, who refers to it also the form recorded 

 by Brady under the name Cypris tumefacta. In the present account 3 other 

 species are provisionally included in the same genus. 



51. Prionocypris lutaria (Koch). 



(PI. LX). 



Cypris lutaria, Koch, Deutschlands Crustacean etc. 

 Syn: Cypris Jurini, Zaddack. 

 ,, lucida, Lilljeborg. 



Herpetocypris strigata, Brady & Norman. 

 Jurini, G. O. Sars. 



peregrina, Ksufmann. 



Eucypris lutaria, Aim. 



Specific Characters. Female. Shell, seen laterally, oblong oval in shape, 

 greatest height somewhat in front of the middle and about equalling half the 

 length, dorsal margin gently arched, with a slight indication to an angle behind 

 the ocular region, and rather steeply sloping behind, ventral margin very 

 slightly sinuated, anterior extremity broadly rounded off, posterior much nar- 

 rower and obliquely blunted; seen dorsally, elliptical in outline, with the 

 greatest width in the middle and about equalling 2 /5 of the length, both ex- 

 tremities pointed and nearly equal. Surface of shell smooth and polished, 

 clothed with short and delicate hairs; inner duplicatures of valves not very 

 broad. Natatory setae of posterior antennae scarcely extending beyond the 

 middle of the succeeding joint. Spines on the outermost masticatory lobe of 



