72 REPORT ON FORAMINIFERA AND OSTRACODA 



figs. 4a-d. Pontocypris faba, Reuss, sp., Egger, 1901, Abhandl. k. buyer. Akud. Wiss., vol. 

 xxi, Abth. ii, p. 420, pi. iv, figs. 44, 45. Pontocijpris (?) faba, Reuss, sp., Chapman, 

 1910, Journ. Linn. Soc. Lond., Zool., vol. xxx, p. 427. 



Should the specific correlation of this form with Reuss's be correct, the species dates 

 from Cretaceous times. It also occurs in the Pliocene (Antwerp Crag) of Europe. At 

 the present day it is entirely restricted to the waters of the southern hemisphere, 

 being recorded from Bass Strait and Honolulu in shallow water, from Funafuti at the 

 great depth of 1050 fathoms, and from Mauritius in moderately deep water. 



Occurrence. — Sample No. 1, 110 fathoms, one specimen (carapace) of an amber- 

 brown colour, with the animal preserved within. 



Family — Cytherid^e 



Genus — Cythere, Muller, 1785 



Cythere foveoluta, G. S. Brady (for references see previous Reports on 

 Ostracoda of Elevated Deposits) 



Occurrence. — Sample No. 4, 153 fathoms, one diminutive valve. 



Cythere davisi, sp. nov. (Plate VI, figs. 46«-c) 



Description. — Shell of the female, seen from the side, oblong, subrectangular, with 

 rounded extremities ; highest at the anterior hinge -joint, height more than half the 

 length ; anterior border obliquely rounded at the dorsal angle, strongly curved towards 

 the ventral, with the anterior edge set with numerous short, sharp spines ; posterior 

 border rounded, and armed with some moderately long sharp spines ; dorsal line slightly 

 concave in the centre, and elevated towards the anterior border ; ventral edge nearly 

 straight, but for a broad depression coinciding with an excavated area on the median 

 surface under the subcentral tubercle ; surface tumid in the median area, and covered 

 with fine, polygonal areola?, each with a central papilla ; the subcentral boss also 

 areolated and pitted ; submarginal flange well developed on the extremities and ventral 

 border ; a sharp salient ridge runs obliquely towards the posterior half of the sub- 

 marginal flange, abruptly turning at right angles near the posterior margin, and finally 

 thinning away at the post-dorsal angle ; a conspicuous tubercle with fossa over the 

 anterior hinge-joint. Edge view, from below, elongate subcordate, increasing in width 

 from front to back up to the middle of the posterior third of the carapace ; with rounded 

 outline below, irregular above, interrupted by the median depression. End view 

 short, subcordate, almost triangular, but with rounded faces. Carapace of the male 

 more elongate and compressed. 



Measurements. — Length of figured example, 1-423 mm. ; greatest height, -73 mm. ; 

 thickness of carapace, -7 mm. 



The above species was at first tentatively regarded as a variety of C. wyville- 

 thomsoni, G. S. Brady,* to which it is related in general form. It differs essentially, 

 however, in having a much thicker carapace, in its rounded posterior extremity, in 

 having a median depression, and in the feeble polygonal surface ornamentation. 



This species is named in honour of Capt. J. K. Davis, of the S.Y. Nimrod, who 

 collected the present samples of soundings in the Antarctic. 



Occurrence. — Sample No. 3, 121 fathoms, frequent ; No. 7, 225 fathoms, one speci- 

 men. All the examples are complete carapaces. 



* Rep. Chall., Zool., pt. iii, 1880, p. 82, pi. xx, figs. 4a-f. 



