149 



phocythere, to include 2 South African species. Besides by their confinement 

 to fresh water, the forms comprised within the present subfamily distinguish 

 themselves from most other Cytheridae by the thin corneous shell, the imper- 

 fectly developed hinge, and by the presence of only a single eye, as in most 

 of the Cypridae. 



Gen. 30. Limnicythere, Brady, 1866. 



Generic Characters. Shell more or less reniform in shape and rather tumid, 

 in some cases provided with tuberculiform lateral prominences. Valves thin 

 and fragile, with the surface smooth or obscurely reticulate, and only sparingly 

 hairy at each extremity; inner duplicatures comparatively narrow. Anterior 

 antennas with the terminal part triarticulate, last joint very narrow and pro- 

 longed. Posterior antennae with 3 apical claws, all issuing from the terminal 

 joint; .lagellum distinctly biarticulate. Vibratory plate of mandibular palp with 

 7 setae, 5 apical and 2 lateral. Masticatory lobes of maxillae comparatively 

 short, palp with the distal joint small, quadrangular in shape, and hawing one 

 of the apical spines, claw-like. Legs moderately slender, with 2 well-developed 

 setae on the anterior ed^c of the basal part, apical claw of last pair much 

 prolonged in male. Caudal rami well defined at the base and more or less 

 conical in shape, with one apical and one lateral bristle. Copulative appen- 

 dages of male with the basal part very large and protuberant in front, terminal 

 part comparatively small, and very sharply marked off from the basal one. 



Remarks. - This genus was established in the year 1866 by Brady, to 

 comprise 2 genuine fresh water species formerly referred to the genus Cythere. 

 The genus was characterised by that author chiefly by the thin and fragile 

 shell, and by the uniform appearence of the spiniform setae on the anterior 

 antennae. Several species referable to this genus have in more recent times 

 been recorded, both from Europe and from other continents. Two of these 

 species are represented in the Fauna of Norway and will be described in the sequel. 



64. Limnicythere sancti-patricii, Brady & Robertson. 



(PI. LXVIII, PI. LXIX, fig. 1.) 



Limnicythere sancti-patricii, Brady & Robertson. 



Ann. Mag. Nat. Hist., ser. IV, Vol. HI, p. 17. 



PI. XVIII, figs. 8-11; PI. XXI, fig. 4. 



Specific Characters. Female. Shell seen laterally, oblong reniform in 

 shape, scarcely higher in front than behind, greatest height about equalling 

 half the length, dorsal margin nearly straight or very slightly concaved in the 



