$2 AUSTRALASIAN ANTARCTIC EXPEDITION. 
Dimensions.—Length, -44 mm; height, -27 mm; width of carapace, -28 mm. 
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Observations—This species belongs to the “ peachstone”’ group of Loxoconcha, 
but differs from the majority described from the Southern Ocean in having a broad 
anterior, narrowed behind in lateral view. It reminds one of the Cretaceous form 
“ Cytheropteron sherborni’’, especially in the disposition of the surface ornament. 
A related form is Loxoconcha modesta G. S. Brady*, obtained from shallow water at 
Smyrna. 
Occurrence —No. 59 (12th December, 1912), 1,320 fathoms. 
Genus XESTOLEBERIS CG. O. Sars. 
XESTOLEBERIS DAVIDIANA Chapman. Plate XXII, figs. 2, 2a. 
Xestoleberis sp. nov. aff. setigera G. 8. Brady, Chapman, 1912, Sci. Res. 
“ Endeavour,” vol. I, pt. II, p. 311. 
Xestoleberis davidiana Chapman, 1915, Sci. Res. “ Endeavour,” vol. III, pt. I, 
p- 45. Idem, 1916, Brit. Ant. Exped., 1907-9, vol. I, pp. 51, 73, pl. VI, figs. 5a-c, 6. 
Observations —This species has occurred in soundings in the Ross Sea near the 
Ice-barrier and also in elevated deposits (Pleistocene) on the slopes of Mount Erebus. 
It was lately found in “ Endeavour” dredgings South of Tasmania at 1,122 fathoms. 
The present soundings containing this species are from the South polar region and from 
the west of Tasmania. 
Occurrence—No. 28 (14th February, 1912), 160 fathoms. No. 29 (14th 
February, 1912), 125 fathoms. No. 31 (15th February, 1912), 220 fathoms. Addi- 
tional sample (3rd September, 1912), 706 fathoms. No. 58 (11th December, 1912), 
1,180 fathoms. No. 60 (12th December, 1912), 1,300 fathoms. No. 139 (27th January, 
1914), 328 fathoms. 
XESTOLEBERIS NANA CG. S. Brady. 
Xestoleberis nana G. 8. Brady, 1880, Rep. Chall. Zool., vol. I, pt. II, p. 126, 
pl. XXXI, figs. 5a-c. Chapman, 1902, Journ. Linn. Soc. Lond. Zool., vol. XXVIII, 
p- 430. Idem, 1915, Sci. Res. “ Endeavour,” vol. III, pt. I, p. 46. 
Observations.—Several typical valves were found here. It has been recorded 
from the South Pacific (Longatabu and Funafuti); from South of Cape Wills, South | 
Australia, and the Kast of Tasmania. The present examples came from the West 
of Tasmania. 
Occurrence.—No. 58 (11th December, 1912), 1,180 fathoms. No. 59 (12th 
December, 1912), 1,320 fathoms. No. 60 (12th December, 1912), 1,300 fathoms. 
1Jones and Hinde, Mon. Pal. Soc., vol. XLIIT 1890. Cretaceous Ostracoda, p. 42, pl. I, figs. 33, 34; pl. IV. 
figs. 20, 21. 
*Trans. Zool. Soc. Lond., vol. V, 1866 (Normania modesta), p. 383, pl. LXI, figs. 13a, b. 
