156
R. K. DELL
gether with Plabellum antarcticum, and the pycnogonid Pycnogonum
gaini .
(iii) Brachiopod Assemblage, in 828 to 1 335 m.
(d) McMurdo Sound Glass Sponge Assemblage
This assemblage develops on a substrate of unsorted rock debris on
which siliceous sponges, especially Rossella and Cinachyra are particularly
common. The bivalve Limatula hodgsoni is also common. Other organisms recorded are the starfish, Odontaster meridionulis, and the pycnogonid, Achelia (Pigrolavatus) spimta. The surface appearance is given
in a bottom photograph (Bullivant, 1967, plate 16).
(e) McMurdo Sound Mixed Assemblage
Bullivant (1967) indicates that this assemblage may be a variant of
the Deep Shelf Mixed Assemblage. The substrate is a mixed sediment
with a high proportion of coarse rock particles. Siliceous sponges are
particularly common in the shallower manifestations of this assemblage.
The free-living crinoid Promachocrinus kerguelensis is apparently
common, as are the molluscs, Cyclomrdia astartoides, Thracia meridionalis, Limatula hodgsoni, Notochiton mirandus and Trophon.
(f) Ross Sea Bathyal Assemblage
Occurring in the basins exceeding 1 000 m in depth north of Ross
Island and in Terra Nova Bay.
Kennett (1 968) discussing the distribution of Foraminifera from
these same Ross Sea stations found a general correlation between his
microfaunal assemblages and the macrofaunal assemblages described
by Bullivant . In general the calcareous foraminiferal assemblages
occurred in association with Bullivant’s Pennell Bank, shelf edge
barnacle, stylasterine coral, Gardineria antarctica, brachiopod, McMurdo Sound mixed and McMurdo Sound glass sponge assemblages and
in part with the Deep Shelf mixed assemblage. Arenaceous foraminiferal
assemblages occurred together with the Deep Shelf mud bottom and
Deep Ooze assemblages and in part with the Deep Shelf mixed assemblage.
A. Bottom photograph
One of the newer techniques to be brought to bear on studies of the
benthos is that of bottom photography. Bullivant was responsible for
a set taken in the Ross Sea and has published some of these (Bullivant,
1959b, 1961,1967) as have Dell (1965), Fell (1961) and Clark (1963). A
R. K. DELL
gether with Plabellum antarcticum, and the pycnogonid Pycnogonum
gaini .
(iii) Brachiopod Assemblage, in 828 to 1 335 m.
(d) McMurdo Sound Glass Sponge Assemblage
This assemblage develops on a substrate of unsorted rock debris on
which siliceous sponges, especially Rossella and Cinachyra are particularly
common. The bivalve Limatula hodgsoni is also common. Other organisms recorded are the starfish, Odontaster meridionulis, and the pycnogonid, Achelia (Pigrolavatus) spimta. The surface appearance is given
in a bottom photograph (Bullivant, 1967, plate 16).
(e) McMurdo Sound Mixed Assemblage
Bullivant (1967) indicates that this assemblage may be a variant of
the Deep Shelf Mixed Assemblage. The substrate is a mixed sediment
with a high proportion of coarse rock particles. Siliceous sponges are
particularly common in the shallower manifestations of this assemblage.
The free-living crinoid Promachocrinus kerguelensis is apparently
common, as are the molluscs, Cyclomrdia astartoides, Thracia meridionalis, Limatula hodgsoni, Notochiton mirandus and Trophon.
(f) Ross Sea Bathyal Assemblage
Occurring in the basins exceeding 1 000 m in depth north of Ross
Island and in Terra Nova Bay.
Kennett (1 968) discussing the distribution of Foraminifera from
these same Ross Sea stations found a general correlation between his
microfaunal assemblages and the macrofaunal assemblages described
by Bullivant . In general the calcareous foraminiferal assemblages
occurred in association with Bullivant’s Pennell Bank, shelf edge
barnacle, stylasterine coral, Gardineria antarctica, brachiopod, McMurdo Sound mixed and McMurdo Sound glass sponge assemblages and
in part with the Deep Shelf mixed assemblage. Arenaceous foraminiferal
assemblages occurred together with the Deep Shelf mud bottom and
Deep Ooze assemblages and in part with the Deep Shelf mixed assemblage.
A. Bottom photograph
One of the newer techniques to be brought to bear on studies of the
benthos is that of bottom photography. Bullivant was responsible for
a set taken in the Ross Sea and has published some of these (Bullivant,
1959b, 1961,1967) as have Dell (1965), Fell (1961) and Clark (1963). A