MOLLUSCA.—HEDLEY. 45 
which differential characters are so obscure. Brookula, introduced by Iredale in 1912 
(Proc. Malac. Soc., x., p. 219), will cover such Antarctic forms as Cyclostrema decussatum 
Pelseneer (Expéd. Antarct. Belge. Moll., 1903, p. 19., pl. v., fig. 48). 
LA&VILITORINA ANTARCTICA Smith. 
(Plate VI., figs. 71, 72.) 
Paludestrina antarctica Smith, Coll. “Southern Cross,” Moll., 1902, p. 204, pl. xxiv., 
fig. 16. 
Levilitorina antarctica Lamy, 2nd Expéd. Antarct. Frang., 1911, Moll., p. 9. 
A Levilitorina, which seems common in shallow water in Adelie Land, answers 
in its younger stages to that figured by Mr. H. A. Smith, from Cape Adare. But when 
full grown the species before me expands at the last whorl, the aperture is freed from 
the previous whorl, and a small umbilicus is formed. This adult is, however, no longer 
than the Cape Adare type. I have concluded that the shells now figured represent 
the immature and adult of a small form of L. antarctica. 
Several specimens dredged May 21st, 1912, and June Ist, 1912, in 3 fathoms, 
among rhizoids of brown alge, Boat Harbour, Commonwealth Bay ; and again, October 
4th, 1912, from 25 fathoms, Commonwealth Bay. A specimen was also taken from 
the stomach of a fish, Harpagifer bispinus. 
LA2VILITORINA CALIGINOSA Gould. 
Inttorina caliginosa Gould, Proc. Bost. Soc. Nat. Hist., ii., 1849, p. 88; Jd., Gould, 
U.S. Expl. Exped., xii., Moll., 1852, p. 198, pl. xiv., fig. 240. 
Hydrobia caliginosa Smith, Phil. Trans. Roy. Soc., vol. 168, 1879, p. 173, pl. ix., fig. 8 ; 
Id., Studer, Archiv. Naturgesch, xlv., 1879, p. 129; Jd., Watson, Chall. Rep. 
Zool., xv., 1886, p. 613. 
Levilitorina caliginosa Martens and Pfeffer, Jahrb. Hamburg. Wiss. Anst., iii., 1886, 
p- 81, pl. 1., fig. 8. 
Paludestrina caliginosa Smith, Proc, Malac. Soc., i., 1898, p. 22. 
Levilitorina caliginosa Pelseneer, Moll. ‘‘ Belgica” Exped., 1903, p. 8; Id., Lamy, Bull. 
Mus. Hist. Nat., xii., 1906, p. 112, and xxi., 1915, p. 71; Jd., Lamy, 1st Expéd. 
Antarct. Frang., Moll., 1906, p. 4; Jd., Strebel, Zool. Jahrb. Syst., xxv., 1907, 
p- 156; Id., Strebel, Schwed. Stidpol. Exped., vi., 1908, p. 51; Jd., Thiele, 
Deutsch. Siidpol. Exped., xiii., 1912, p. 235, pl. xiv., fig. 25; JId., Suter, 
Manual N.Z. Moll., 1913, p. 190, pl. xxxv., fig. 11. 
About 60 specimens of this were gathered, March 23rd, 1912, by Mr. H. Hamilton, 
at Hassellborough Bay, Macquarie Island. In his notes he remarked on it as “ a small 
brown variety, attaches itself to rocks or algae, exceedingly common on the coast.” 
