MOLLUSCA.—HEDLEY. 
39 
Minolia dulcis Smith. 
Valvatella dulcis Smith, Nat. Antarct. Exped., ii., 1907, Moll., p. 10, pi. ii., fig. 8. 
Margarites dulcis Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 190, pi. xi., fig. 21 ; 
Id., Smith, “ Terra Nova ” Exped., Zool., ii., 1915, p. 63. 
One, October 4th, 1912, from 25 fathoms ; three, December 21st, 1913, from 55-60 
fathoms ; and three more, December 22nd, 1913, from 350-400 fathoms, in Common¬ 
wealth Bay. Two dredged, December 31st, 1913, from 157 fathoms, in the D’Urville 
Sea, in South Lat. 66° 32' and East Long. 141° 39'. 
Minolia thielei sp. nov. 
(Plate V., fig. 59.) 
? Margarites sp. Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 191, pi. xi., fig. 22. 
Shell trochoidal, thin, lustrous, narrowly umbilicate, bicarinate. Apex tilted, 
white, opaque, mamillate, punctate. Remainder of the shell translucent, pearly with 
a green and purple lustre. Whorls four, parted by a suture which lies in a deep gutter. 
Sculpture : the spirals, which increase by intercalation, finally amount in my larger 
specimen to 33, of which two on the periphery are larger than the rest, and 20 on the base 
are small and close-set. On the penultimate the spirals are six, and on the anti¬ 
penultimate four. Only the interior of the umbilicus has no spirals. Everywhere 
very delicate radial threads traverse the flat interstices ; but on two or three of the 
innermost spirals these enlarge and denticulate the crest of the rib. Aperture 
subcircular, the columella margin a little expanded, a slight glaze of callus over the 
preceding whorl and with the outer lip sharply dentate by the external sculpture. 
Height, 8 ; maj. diam., 9 ; min. diam., 7mm. 
One specimen (type) dredged, January 31st, 1914, in 110 fathoms, hard ground, 
near the Shackleton Ice-shelf, in South Lat. 64° 32' and East Long. 97° 20'. Another 
smaller specimen taken December 28th, 1913, in 288 fathoms, off the Mertz Glacier 
Tongue, in South Lat. 66° 55' and East Long. 145° 21'. 
Save that our species is bicarinate it resembles the unnamed “ Gauss ” fragment 
figured by Dr. Thiele, after whom, in appreciation of his admirable work on Antarctic 
Mollusca, it is now called. 
Thoristella aucklandica Smith. 
Calliostoma aucklandicum Smith, “ Southern Cross ” Collections, 1902, p. 207, pi. xxiv., 
fig. 5. 
Thoristella aucklandica Iredale, Trans. N.Z. Inst., xlvii., (1914) 1915, p. 436. 
Twelve specimens, June 28th, 1912, from 1 fathom, Carnley Harbour, Auckland 
Islands. This species seems to be related generically to Calliostoma rctiarium Hedley 
and May, from South Tasmania. 
