42 AUSTRALASIAN ANTARCTIC EXPEDITION. 
Dr. Thiele has united the southern L. antarctica to the L. coppingeri from Magellan 
Straits, a connection recently accepted by the author of these names. 
From Commonwealth Bay the expedition brought numerous examples, September 
3rd, 1912, from 25 fathoms; seven, December 14th, 1913, from 45-50 fathoms; and 
four more, December 21st, 1913, from 55-60 fathoms. 
LEPETA DEPRESSA sp. nov. 
(Plate VI., fig. 64.) 
Shell thin and delicate, very depressed, elongate-ovate. Colour, uniform drab. 
Apex at one-third of the length. Sculpture: anterior end faintly rayed, sides and posterior - 
end decorated with about 40 radiating raised lines which at the sides curve forwards 
and downwards. These radials are widely spaced by flat interstices. As growth 
proceeds fresh radials are intercalated. Fine concentric hair lines override both radials 
and interstices. Height, 3-5mm.; length of spm., 13mm.; probable length when 
entire, 16mm.; breadth actually, 9mm., probably 10mm. when complete. 
This very distinct species is represented by a single broken shell, dredged January 
28th, 1914, from 240 fathoms, bottom ooze, off the Shackleton Ice-shelf, in South Lat. 
65° 20’ and East Long. 95° 27’. 
NACELLA DELESSERTI Philippi. 
(Plate VI., figs. 65, 66, 67, 68, 69.) 
Patella delesserti Philippi, Abbild. Besch., iii., 1849, p- 9, pl. i., fig. 5. 
Patella redimiculum Reeve, Conch. Icon., Vill., 1854, pl. xx., fig. 50. 
? Patella strigilis Hombron and Jacquinot, Ann. Sci. Nat., (2), xvi., 1841, p. 190. 
The identification of southern limpets is not an easy task, as might be inferred 
from their intricate synonymy. It is probable that the species fixed on the kelp are 
always distinct from those living on the rock. Young shells are not readily matched 
with old without an extensive series. 
A limpet found by Mr. H. Hamilton to be generally distributed on rocks in the 
littoral zone of Macquarie Island thus changes in its development. The young shell 
is proportionately narrower than the adult and has the apex more excentric. Philippi’s 
drawing of a limpet from Marion Island, 22mm. long, is intermediate in these respects 
between a young Macquarie Island shell, 12mm. long (fig. 67), and a more mature 
Macquarie Island individual, 53mm. long (fig. 65). The Marion Island species has 
been buried in the synonymy of different other species by subsequent writers. 
