34 AUSTRALASIAN ANTARCTIC EXPEDITION. 
modification of C. clausi, in which the posterior elevation is greater and the antero- 
median area of the valve is more ruggedly pronounced in the depression and swollen 
prominences. The type species was recorded from Simon’s Bay, South Africa. 
Occurrence.—No. 60 (12th December, 1912), 1,300 fathoms. 
CYTHERURA COSTELLATA G. S. Brady. 
Cytherura costellata G. 8. Brady, 1880, Rep. Chall. Zool., vol. I, pt. ITI, p. 134, 
pl. XXXII, figs. 7a-d. Chapman, 1916, Brit. Ant. Exped. 1907-9, Geol., vol. II, p. 51, 
pl. VI, fig. 7. 
Observations —The former occurrences of this species were in shallow water 
soundings; Balfour Bay, Kerguelen Island, and in elevated deposits (Pleistocene) on 
the slopes of Mount Erebus. It is here found opposite Kaiser Wilhelm II Land and west. 
of Tasmania. 
Occurrence.—No. 31 (15th February, 1912), 220 fathoms. No. 58 (11th Decem- 
ber, 1912), 1,180 fathoms. No. 59 (12th December, 1912), 1,320 fathoms. 
CYTHERURA CRYPTIFERA Cf. S. Brady.] 
Cytherura cryptifera G. S. Brady, 1880, Rep. Chall. Zool., vol. I, pt. Ill, p. 134, 
pl. XXXII, figs. 4a-c. Chapman, 1915, Sci. Res. ‘‘ Endeavour,’ vol. III, pt. I, p. 46. 
Observations. —First found in Bass Strait, this species has since been discovered 
in dredgings made by the “ Endeavour,” east of Tasmania, in 777 fathoms. The 
present examples, from west of Tasmania, are separated valves and typical in 
every respect. 
Occurrence—No. 59 (12th December, 1912), 1,320 fathoms. No. 60 (12th 
December, 1912), 1,300 fathoms. 
CYTHERURA LILLJEBORGI G. S. Brady. 
: Cytherura lilljeborgi G. S. Brady, 1880, Rep. Chall. Zool., vol. I, pt. III, p. 132,. 
pl. XXXII, figs, 6a-d. 
Observations —It is interesting to note this second appearance of a rare species, 
known only hitherto from Balfour Bay, Kerguelen Island (20-50 fathoms). The present. 
localities are—opposite Kaiser Wilhelm II Land (220 fathoms); opposite Adelie Land. 
(328 fathoms); and west of Tasmania (1,320 fathoms). 
Occurrence.—No. 31 (15th February, 1912), 220 fathoms. No. 59 (12th. 
December, 1912), 1,320 fathoms. No. 139 (27th January, 1914), 328 fathoms. 
CyTHERURA OBLIQUA G. S. Brady. 
Cytherura obliqua G. 8. Brady, 1880, Rep. Chall. Zool., vol. I, pt. III. p. 131, 
pl. XXXII, figs. la-d. Chapman, 1916, Brit. Ant. Exped. 1907-9, Geol., vol. I, 
p. 73, pl. VI, fig. 50. 
