84
R. E. DELL
The range of Callochiton bouveti Thiele starts from the Falklands, and
includes South Georgia, the South Orkneys, the South Shetlands and
the Antarctic Peninsula. As its specific name indicates it also occurs
off Bouvet Island. Ischnochiton dorsuosus Haddon has been recorded
from the Magellan region, South Georgia and the Antarctic Peninsula.
Chuetopleura brucei Iredale was described from the South Orkneys and
has so far been recorded from no other locality. The genus Chaetopleura
is well represented in southern South America. The Magellan species
Nuttalochiton hyadesi (Rochebrune) has been recorded from the Weddell
Sea (Castellanos, 1959). There is thus a steady fall off in the number of
chiton families as one moves down the Scotia Arc to the Antarctic
Peninsula and extends east and west of it around the Antarctic Continent.
2. Scaphopoda (Fig. 9)
There are very few Antarctic scaphopods, only five species having
been recorded. Records of the group have often been included in general
papers on Mollusca but the following four refer to Scaphopoda alone :
Jaeckel (1932), Odhner (1931), and Plate (1908a, b). The most recent
summaries of the fauna have been included in papers by Odhner (1944)
and Dell (1964b).
The species currently known from Antarctic waters are :
Dentalium eupatrides Melville and Standen, recorded only from
71'22's 16'34'W in 2 579 m.
Dentalium (Fissidentalium) majorinurn Mabille and Rochebrune,
Southern Chile, the Magellan Region, the Patagonian shelf, Falkland
Islands, South Shetlands and circumpolar around the Antarctic
Continent.
Cadulus thielei Plate, Gauss Station, 380-385 m, Ross Sea.
Cadulue (Polyschides) dalli antarcticum Odhner, South Orkneys,
South Shetlands, probably circum-Antarctic.
? Xiphonodentalium minimum Plate, Gauss Station, 3 423 m.
No Scaphopoda have as yet been recorded from South Georgia
although the molluscan fauna must by now be well known.
The correct identity of Siphonodentalium minimum is still in doubt,
and Cadulus thielei and Dentalium eupatrides have been recorded only
from very restricted areas. Additional species may well be collected from
deep-water stations but Dentalium (Fissidentalium) majorinurn and
Cadulus (P.) dalli antarcticum are the only common species in moderate
depths. The Dentalium also occurs off southern South America, and
the nominate subspecies of Cadulus dalli (which is very closely allied to
R. E. DELL
The range of Callochiton bouveti Thiele starts from the Falklands, and
includes South Georgia, the South Orkneys, the South Shetlands and
the Antarctic Peninsula. As its specific name indicates it also occurs
off Bouvet Island. Ischnochiton dorsuosus Haddon has been recorded
from the Magellan region, South Georgia and the Antarctic Peninsula.
Chuetopleura brucei Iredale was described from the South Orkneys and
has so far been recorded from no other locality. The genus Chaetopleura
is well represented in southern South America. The Magellan species
Nuttalochiton hyadesi (Rochebrune) has been recorded from the Weddell
Sea (Castellanos, 1959). There is thus a steady fall off in the number of
chiton families as one moves down the Scotia Arc to the Antarctic
Peninsula and extends east and west of it around the Antarctic Continent.
2. Scaphopoda (Fig. 9)
There are very few Antarctic scaphopods, only five species having
been recorded. Records of the group have often been included in general
papers on Mollusca but the following four refer to Scaphopoda alone :
Jaeckel (1932), Odhner (1931), and Plate (1908a, b). The most recent
summaries of the fauna have been included in papers by Odhner (1944)
and Dell (1964b).
The species currently known from Antarctic waters are :
Dentalium eupatrides Melville and Standen, recorded only from
71'22's 16'34'W in 2 579 m.
Dentalium (Fissidentalium) majorinurn Mabille and Rochebrune,
Southern Chile, the Magellan Region, the Patagonian shelf, Falkland
Islands, South Shetlands and circumpolar around the Antarctic
Continent.
Cadulus thielei Plate, Gauss Station, 380-385 m, Ross Sea.
Cadulue (Polyschides) dalli antarcticum Odhner, South Orkneys,
South Shetlands, probably circum-Antarctic.
? Xiphonodentalium minimum Plate, Gauss Station, 3 423 m.
No Scaphopoda have as yet been recorded from South Georgia
although the molluscan fauna must by now be well known.
The correct identity of Siphonodentalium minimum is still in doubt,
and Cadulus thielei and Dentalium eupatrides have been recorded only
from very restricted areas. Additional species may well be collected from
deep-water stations but Dentalium (Fissidentalium) majorinurn and
Cadulus (P.) dalli antarcticum are the only common species in moderate
depths. The Dentalium also occurs off southern South America, and
the nominate subspecies of Cadulus dalli (which is very closely allied to