REPORT ON FORAMINIFERA AND OSTRACODA 51 



along the median line, not so much produced anteriorly, and with greater compression 

 of the extremities. Its ornament, moreover, consists of scattered circular pittings 

 without linear arrangement. 



Genus — Xestoleberis , G. 0. Sars, 1865 

 Xestoleberis davidiana, Chapman (Plate VI, Figs. 5«-5c, 6) 



Xestoleberis davidiana, Chapman, 1915, Zool. Results, "Endeavour," vol. iii, 

 Pt, I, p. 45. 



Description. — Carapace in side view, semiovate, bluntly pointed in front and 

 behind ; back rounded, slightly angulated at the summit ; ventral border gently 

 concave, edge rounded, ventral surface excavate. Edge view, compressed ovate. 

 End view conical, with rounded sides. Surface of shell more or less numerously 

 pitted, each pit or group of pits surrounded by a white spot ; probably armed with 

 fine bristles (as in X. setigera) in the living state. A few valves of narrower build are 

 present, one of which is figured ; they are probably referable to male specimens. 



Measurements. — Length of type specimen, *48 mm. ; greatest thickness of carapace, 

 •3 mm. ; height, *3 mm. 



Observations. — At first sight this species reminds us of X. setigera, G. S. Brady,* 

 both in the narrow side view of the carapace and the punctate ornament. The latter, 

 however, in X. setigera is distinctly papillate. This present species is distinguished 

 by the subacute extremities in side view and the pointed dorsal area of the end view. 



X. davidiana, whilst related to X. setigera, also a southern form, may be regarded 

 as distinct on the strength of the above characters, which are constant throughout 

 the numerous specimens occurring in the elevated deposit from the slopes of 

 Mount Erebus. 



Genus — Cytherura, G. 0. Sars, 1865 

 Cytherura costellata, G. S. Brady (Plate VI, Fig. 7) 



Cytherura costellata, G. S. Brady, 1880, Rep. Chall., Zool., vol. i, Pt. Ill, p. 134, 

 PI. XXXII, Figs. la-Id. 



A single valve of this pretty little species was found in the elevated material. 

 It measures -5 mm. in length, exactly that of the type figured by Dr. G. S. Brady, 

 who obtained his specimens from Balfour Bay, Kerguelen Island, in 20-50 fathoms. 

 This occurrence, therefore, is the second recorded for the species. 



* Rep. Chall. , Zool., vol. i, Pt. Ill, 1880, p. 125, PI. XXXI, Figs. 2a-d, Sa-c. 



