734 Beady and Noeman — Monograph of the Marine and Freshtvater Ostracoda 



Limnicythere compressa, Brady & Norman. 



1889. Limnicythere inopinata, . . Var. compressa. Brady & Norman, " Monog. 



Marine and Freshwater Ostracoda " (Trans. 

 Roy. Dub. Soc, ser. 2, vol. iv.), p. 170, 

 pi. xvii., figs. 18, 19. 



We have come to the conclusion that this Ostracod must be regarded as 

 distinct from L. inopinata, to which we had assigned it as a variety. We have 

 now found it in a second locality. In both habitats the form is constant, and 

 shows no approach to L. inopinata, from which it is at once distinguished by the 

 much more gibbous central portion of the valves and more concave ventral margin, 

 but especially by the extraordinary compression of the anterior and posterior 

 extremities. 



Habitat. — Whitefield Loch, Wigtonshire ; Loch Aber, Kircudbrightshire 

 (A. M. N.). 



Limnicytliere Sancti-Patricii, Brady & Robertson. 

 Distribution. — Norway fG. O. Sars). 



Cytheridea(?) monensis, n. sp. 



(PLlxviii., figs. 10, 11.) 



Shell, seen from the side, subovate, greatest height equal to rather more than 

 half the length, and situated near the middle ; anterior extremity evenly rounded, 

 posterior also well I'ounded, but narrower ; dorsal margin sloping with a gentle 

 curve towards the front, and in a slightly sinuated line backwards, the posterior 

 angle being quite rounded away ; ventral margin nearly straight. Seen from 

 above, the outline is subcuneate, though not very much wider behind than in 

 front, and the left valve overlaps the right at both extremities ; greatest width 

 at the posterior extremity, and equal to less than half the length ; anterior extre- 

 mity wide and rounded, with abruptly converging sides, mucronate in the middle; 

 posterior subtruncate, the margin of each valve almost rectilinear, and meeting 

 its neighbour at an obtuse angle. Surface of the shell covered with large, deeply 

 impressed subrotund pittings ; anterior border fringed below the middle with a 

 series of short, bluntly rounded teeth, which form a sort of crenulated crescentic 

 flange, the posterior ventral angle produced in a somewhat similar fasliion, but 

 with a smaller number of teeth, which are also more irregular, and give a marked 

 prominence to the angle of the shell. Length, 0'65 mm. 



