44 AUSTRALASIAN ANTARCTIC EXPEDITION. 
bluish silver mottled with horn brown streaks, the latter being more opaque in 
transmitted light than the background, muscle print a porcellanous callus, ashen and 
sharply defined. Sculpture: from 30 to 40 low crowded radial ribs increasing by 
splitting ; these faintly denticulate the margin. Well preserved specimens show a 
concentric ornament of fine dense hair lines, among which are irregularly interposed 
more prominent cords which sometimes form vaulted scales on the ribs. Aperture 
ovate, usually broader behind the apex. 
A shell here figured is 52mm. long, 40mm. broad, 21mm. high. Another is 
62 x 49 x 2lmm., and another 61 x 49 x 31. The young shell figured (fig. 67) is 
12mm. long, 8mm. broad, 3mm. high. 
NACELLA. KERGUELENENSIS Smith. 
Patella ferruginea Reeve (not Gmelin), Conch. Icon., viii., 1854, pl. xvii. fig. 40. 
Patinella magellanica Dall, Bull. U.S. Nat. Mus., iii., 1876, p. 43. 
Patella kerguelenensis Smith, Phil. Trans., vol. 168, 1879, p. 177, pl. ix., fig. 13; Id., 
Studer, Archiv. Naturg., xlv., 1879, p. 128; IJd., Watson, Chall. Rep. Zool., 
xv., 1886, p. 27. 
Nacella kerguelenensis Pilsbry, Man. Conch., xiti., 1891, p. 121, pl. xliii., figs. 7, 8; Id., 
Thiele, Deutsch. Stidpol. Exped., xiii., 1912, p. 234 : Id., Lamy, Bull. Mus. 
Hist. Nat., xxi., 1915, p. 73. 
Patinella kerguelenensis Strebel, Zool. Jahrb. Syst., xxv., 1907, p. 153, pl. iv., fig. 58. 
Until Dr. H. Strebel found this in the Magellan province it had not been noted 
beyond Heard and Kerguelen Islands. Possibly masses of floating kelp, so common 
in these seas, afford it a means of dispersal. Mr. H. Hamilton collected, on Macquarie 
Island, four beach-worn shells, one of which measured, length, 88; breadth, 68; and 
height, 48mm. The best preserved of these was a dark copper-brown inside and the 
most aged were contracted anteriorly in a snout, but broadly rounded behind. The 
apex was well in front of the centre. All agreed generally with specimens from 
Kerguelen Island determined by Mr. E. A. Smith. 
BRoOoKULA Sp. 
(Plate VI., fig. 70.) 
Shell minute, turbinate, widely umbilicate. Whorls two and a half, rounded, 
scarcely in contact, the apex with a half turned over tip. Colour white. Aperture 
entire, circular, lip simple. Maj. diam., 0-8; min. diam., 0:6 ; height, 06mm. 
Two eroded and probably immature specimens were collected, J anuary 19th, 1912, 
by Mr. H. Hamilton, on worm tubes, at Aerial Cove, Macquarie Island. As the original 
surface was mostly etched away it seems best not to give a specific name to a form in 
