58 
AUSTRALASIAN ANTARCTIC EXPEDITION. 
Pareuthria innocens Smith. 
Thesbia innocens Smith, Nat. Antarct. Exped., ii., 1907, Moll., p. 4, pi. i., figs. 1, 1r ; 
Id., Hedley, Brit. Antarct. Exped., ii., 1911, p. 6. 
Pareuthria innocens Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 212, pi. xiii., fig. 23, 
pi. xvi., fig. 22 ; Id., Smith, “ Terra Nova ” Exped., Zool., ii., Moll., 1915, 
p. 72. 
Several specimens, September 4th, 1912, from 25 fathoms ; five, December 14th, 
1913, from 45-50 fathoms ; and one, November 21st, 1913, from 55-60 fathoms, in 
Commonwealth Bay, Adelie Land. 
Probuccinum tenuistrjatum sp. nov. 
(Plate VIII., figs. 95, 96.) 
Shell conical, thin, and semitransparent. Colour uniform isabelline, except the 
outer lip, which is white. Whorls five, the two first constituting a smooth dome-shaped 
protoconch. Epidermis thin, caducous, its fragments show fine radial laminae. 
Sculpture : very fine and dense waved spiral hair lines, decussated at irregular intervals 
by corresponding growth lines and an occasional varix. Aperture oblique, anteriorly 
truncated, pyriform. Inner lip a thin smear of transparent callus. Outer lip thin, 
expanded and reflected posteriorly, supported by a distant and parallel varix. Canal 
wide, scarcely produced. Length, 16 ; breadth, 9mm. 
This species is like, and possibly identical with, Probuccinum tenerum, as figured 
by Thiele (op cit., pi. xiii., fig. 21), but differs in form and sculpture from Neobuccinum 
tenerum, as originally figured by Smith. 
A single complete and fresh shell was taken, December 31st, 1913, from 157 fathoms, 
ooze, in the D’Urville Sea, in South Lat. 66° 32' and East Long. 141° 39'. 
Probuccinum costatum Thiele. 
Probuccinum costatum. Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 211, pi. xiii., fig. 22. 
One, December 28th, 1913, from 288 fathoms, ooze, off the Mertz Glacier Tongue, 
Adelie Land, in South Lat. 66° 55' and East Long. 145° 21' ; one, January 27th, 1914, 
from 120 fathoms, rocky ground, in the Davis Sea, in South Lat. 66° 8' and East Long. 
94° 17' ; and one, January 31st, 1914, from 120 fathoms, near the Shackleton Ice-shelf, 
in South Lat. 64° 32' and East Long. 97° 20'. 
