22 
AUSTRALASIAN ANTARCTIC EXPEDITION. 
Adacnarca nitens Pelseneer. 
Adacnarca nitens Pelseneer, Voy. : ‘Belgica” Moll., 1903, pp. 24, 41, pi. vii., figs. 83-88 ; 
Id., Lamy, 1st Exped. Antarct. Fran 9 ., 1906, Moll., p. 19 ; Id., Smith, Nat. 
Antarct. Exped., ii., 1907, Moll., p. 5, pi. iii., fig. 6 ; Id., Mortensen, Deutsch. 
Siidpol. Exped. Zool., xi., 1909, p. 20, pi. ii., fig. 2 ; Id., Lamy, 2nd Exped. 
Antarct. Fran^, 1911, Moll., p. 27 ; Id., Hedley, Brit. Antarct. Exped., ii., 
1911, Moll., p. 3; Id., Thiele, Deutsch. Stidpol. Exped., xiii., 1912, p. 228; 
Id., Smith, “ Terra Nova ” Exped. Zool., 1915, p. 76. 
This species develops a wide range in depth and longitude, comparable to that 
of Neobuccinum eatoni or Chlamys colbecki. The largest individuals of this collection 
reach the size noted by Smith of length 6-5 and height 7mm. The mollusc clings to 
stalks of plants and such objects with a few sparse byssus threads. 
One, October 4th, 1912, in 25 fathoms ; one, December 14th, 1913, in 45-50 fathoms ; 
one, December 21st, 1913, in 55-60 fathoms ; and one, December 22nd, 1913, in 350-400 
fathoms—all in Commonwealth Bay. Again, eight, December 28th, 1913, in 288 fathoms, 
ooze, off the Eastern Barrier of Adelie Land, in South Lat. 66° 55' and East Long. 145° 
21' ; two, December 31st, 1913, in 157 fathoms, South Lat. 66° 32' and East Long. 
141° 39' ; three, January 27th, 1914, in 120 fathoms, stony ground, in Davis Sea, in 
South Lat. 66° 8' and East Long. 94° 17' ; two, January 29th, 1914, in 325 fathoms, 
ooze, off the Shackleton Ice-shelf, in South Lat. 65° 6' and East Long. 96° 13' ; and 
two, January 31st, 1914, in 110 fathoms, off the Shackleton Ice-shelf, in South Lat- 
64° 32' and East Long. 97° 20'. 
Chlamys colbecki Smith. 
Pecten colbecki Smith, “ Southern Cross ” Coll., 1902, p. 212, pi. xxv., fig. 11 ; Id., Melvill 
and Standen, Trans. Roy. Soc. Edinb., xlvi., 1907, p. 146 ; Id., Ibid., Scotia 
Zool., v., 1907, p. 117 ; Id., Smith, Nat. Antarct. Exped., ii., 1907, Moll., p. 6, 
pi. iii., fig. 9 ; Id., Lamy, 2nd Exped. Antarct. Franp., 1911, Moll., p. 23 ; 
Id., Hedley, Brit. Antarct. Exped., ii., 1911, pp. 1, 3 ; Id., Thiele, Deutsch. 
Siidpol. Exped., xiii., 1912, p. 225, pi. xvii., fig. 1. 
Chlamys colbecki Smith, “ Terra Nova Exped., ii., Zool., 1915, p. 77. 
Pecten racovitzai Pelseneer, Voy. “ Belgica,” Moll., 1903, p. 27, pi. viii., figs. 101,102 ; Id., 
Lamy, 1st Exped. Antarct. Fran§., 1906, p. 16, pi. 1., figs. 19-21. 
This species continues to develop a circumpolar range. The largest of the collection 
here examined has a height of 85 and a length of 90mm. 
It is significant of the vertical uniformity of the temperature in these seas that the 
finest example should come from the deepest haul, and that though, as Murray says, 
abundant in shallow water. 
