MOLLUSCA.—HEDLEY. . 53 
Two half-grown empty shells were dredged, December 28th, 1913, in 288 fathoms, 
bottom ooze, off the Mertz Glacier Tongue, Adelie Land, in South Lat. 66° 55’ and East 
Long. 145° 21’. 
LAMELLARIOPSIS AURORA sp. nov. 
(Plate VIL, fig. 82.) 
Animal very soft, apparently depressed-cordate, back covered with large 
irregularly spaced tubercles. Mantle margin wide, extending far beyond the foot or 
body. Foot comparatively small, broad in front and pointed behind. Tentacles 
rather long and far apart, eyes at the external bases. Verge long and sickle-shaped. 
Length, about 70mm. 
This species is described from torn and distorted material, but it evidently differs 
from the type of the genus Lamellariopsis turqueti Vayssiere,* by the absence of the 
grained cords which in that species reticulate the surface. 
Three specimens, January 31st, 1914, from 110 fathoms, hard ground, off the 
Shackleton Ice-shelf, in South Lat. 64° 32’ and East Long. 97° 20’. 
If Lamellaria ampla Strebel + is figured the natural size then the new form much 
exceeds it. 
MARSENIOPSIS MOLLIS Smith. 
_ Lamellaria mollis Smith, “ Southern Cross ’’ Coll., 1902, p. 205, pl. xxiv., figs. 19, 21. 
Marseniopsis mollis Thiele, Deutsch. Siidpol. Exped., xili., 1912, p. 200; Zd., Smith, 
“Terra Nova” Exped., u1., Moll., 1905, p. 66. 
From Commonwealth Bay: three, September 4th, 1912, from 25 fathoms ; another 
December 14th, 1913, from 45-50 fathoms ; another, December 21st, 1913, from 55-60 
fathoms ; and another, December 22nd, 1913, from 350-400 fathoms. One, December 
28th, 1913, from 288 fathoms, ooze, off the Mertz Glacier, in South Lat. 66° 55’ and 
East Long. 145° 21’. One, January 21st, 1914, from 60 fathoms, rocky ground, off 
Drygalski Island. Two, January 27th, 1914, from 120 fathoms, rocky ground, in the 
Davis Sea, in South Lat. 66° 8’ and East Long. 94°17’. One, January 31st, 1914, from 
110 fathoms, hard ground, off the Shackleton Ice-shelf, in South Lat. 64° 32’ and Hast 
Long. 97° 20’. 
HARPOVOLUTA VANHOFFENI Thiele. 
Harpovoluta vanhoffent Thiele, Deutsch. Siidpol. Exped., xiii., 1912, p. 213, pl. xiv., 
fig. 1. 
One of the Mawson collection is 75mm. long, so the species attains now a larger 
size as well as a wider range. Where the animal is present, a large commensal actinian 
is usually seated on the back of the shell. 
* Vayssi¢re.—lst Expéd. Antarct. Frang., 1906, p. 40, pl. iv., figs. 42-3. 
+ Strebel.—Zool. Jahrb., xxiv., 1907, p. 145, pl. xi., figs. 70-1. 
