48 AUSTRALASIAN ANTARCTIC EXPEDITION. 
By colour and sculpture it is distinguished from R. adarensis which it resembles 
inform. From the figure R. fraudulenta seems a stouter shell. It is named in honour 
of Mr. F. H. Bickerton, F.R.G.S., who spent two years at the Main Base, Commonwealth 
Bay. 
SUBONOBA DESERTA Smith. 
Rissoa deserta Smith, Nat. Antarct. Exped., i1., 1907, p. 9, pl. u1., fig. 1; Jd., Melvill 
and Standen, Trans. Roy. Soc. Edinb., xlviii., 1912, p. 349; Jd., Scotia Zool., 
vi., 1912, p. 123; Jd., Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 194, pl. 
xi., fig. 33. 
A dozen examples of this featureless shell occurred, September 3rd, 1912, and 
six, December 14th, 1913, in 45-50 fathoms, Commonwealth Bay. 
SUBONOBA GELIDA Smith. 
Rissoa gelida Smith, Nat. Antarct. Exped., ii., 1907, Moll., p. 9, pl. u1., fig. 5; Id., 
Thiele, Deutsch. Siidpol. Exped., xii., 1912, p. 195, pl. xi., figs. 37, 38; Id., 
Smith, “ Terra Nova” Exped., ii., Moll., 1915, p. 65. 
Fifty specimens dredged, September 8rd, 1912, from 25 fathoms; and nine, 
December 14th, 1913, from 45-50 fathoms, Commonwealth Bay. 
SUBONOBA GLACIALIS Smith. 
Rissoa glacialis Smith, Nat Antarct. Exped., ii., 1907, Moll., p. 9, pl. u., fig. 4; Id., 
Hedley, Brit. Antarct. Exped., ii., 1911, Moll., p. 5; Id., Smith, “ Terra Nova ” 
Exped., ii., Moll., 1915, p. 65. 
Two specimens dredged, September 3rd, 1912, from 25 fathoms; and_ three, 
December 14th, 1913, from 45-50 fathoms, in Commonwealth Bay. 
SuBonosBaA ovata Thiele. 
Rissoa ovata Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 194, pl. xi., fig. 36. 
One, October 4th, 1912, from 25 fathoms, in Commonwealth Bay. 
SUBONOBA WILKESIANA sp. nov. 
(Plate VII., fig. 77.) 
Shell broad-ovate, subperforate. Colour buff. Whorls three and a half, inflated, 
constricted at the suture. Sculpture: close, fine, spiral threads evenly distributed 
and irregularly decussated by slight growth lines. Aperture subquadrate, entire 
columella margin a little reflected. Length, 2-5; breadth, 1-8mm. 
