ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 335 



PODOCOPA. 



Fam. CYPRID/E. 



Genus Macrocypris, G. S. Brady, 1868. 

 Macrocypris maculata, G. S. Brad)'. (PI. XIV. figs. 1 and 2.) 



1865, Cytherideis maculata, Brady, Trans. Zool. Soc., vol. v. p. 367, pi. Ivii. fig. 12, a-b. 



1880, Macrocypris maculata, Brady, Ostracoda of the " Challenger" Exped., p. 44, pi. i. fig. 2, a-d. 



Habitat. Scotia Bay, South Orkneys; collected April 1903; Station 325, 

 60 43' 42" S., 44 38' 33" W. Several specimens were obtained ; they varied somewhat 

 in size. One of the larger specimens measures 1'5 mm. in length; height rather less 

 than half the length, highest in the middle ; dorsal margin arcuate, sloping about 

 equally towards both ends, but the posterior is rather narrower than the other ; lower 

 margin slightly concave and sinuate, especially towards the front. Seen from above, 

 the shell is elliptical in outline, widest in the middle, width equal to about one-third 

 of the length, tapering equally to each end ; both ends narrow ; colour brownish. 

 This species appears to be widely distributed. 



Fam. CYTHERID^E. 



Genus Cy there, 0. F. Miiller, 1785. 

 Cythere inornata, new species. (PI. XIV. figs. 9 and 10.) 



Shell, seen from the side, oblong ; height equal to about half the length ; dorsal 

 margin nearly straight, ventral margin slightly incurved. The posterior extremity 

 slopes at first abruptly downwards, then becomes boldly rounded ; the anterior end is 

 somewhat similar, but is rather more produced, especially below. Seen from above, the 

 shell is moderately tumid, widest in the middle, greatest width equal to rather more 

 than half the length, sides evenly rounded, but tapering rather more towards the 

 anterior end, which is wedge-shaped. Shell surface rough, with numerous small 

 circular pits and setiferous papillse between. Length of shell about 1'2 mm. 



Habitat. Scotia Bay, South Orkneys, June 1903; Station 325, 60 43' 42" S., 

 44 38' 33" W. 



Cythere quadridens, new species. (PL XIV. figs. 15 and 16.) 



Shell, seen from the side, oblong, highest in front, the height equal to rather more 

 than half the length ; anterior end boldly rounded ; posterior extremity truncated 

 above, slightly produced below the middle, and provided with about four more or less 

 distinct tooth-like projections. The dorsal margin shows a slight elevation immediately 

 over the anterior hinge, thence it slopes backwards to the posterior extremity in a 

 nearly straight line, where it is abruptly angulated ; lower margin slightly excavated 

 behind the anterior extremity, and thence converges gently backwards. Seen from 

 above, the shell is widest behind the middle, greatest width scarcely equal to half the 



(ROY. soc. KDIN. TKANS., VOL. XLVIII., 581.) 



