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Advances in Marine Biology, Vol. 10 by Frederick S. Russell, Maurice Yonge (Eds.)

By Frederick S. Russell, Maurice Yonge (Eds.)

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McKnight (1962) recorded that many of the 67 genera he recorded were believed to be confined to the Antarctic but no recent biogeographical account has come to notice. McKnight has recorded benthonic assemblages from the Ross Sea, the Weddell Sea, Queen Maud Land with a few records from the Palmer Peninsula. Other records are available for other areas, but some critical systematics w i l l surely be needed before comparisons can reasonably be made. B. Porifera It has been claimed that the abundance of sponges in the Antarctic makes the present as much the Age of Sponges as was the Cretaceous (Burton, 1932).

Saidova, 1961 ; Bandy and Echols, 1964). Kennett (1968, p. 34) believes that solution of calcium carbonate occurs at shallower depths in the Ross Sea because the water below about 550 m is highly unsaturated for a number of reasons. 00%). Such cold water would allow 34 R. K . DELL an increase in the amount of dissolved carbon dioxide, which is readily available in the Ross Sea since sunlight is lacking for about half the year, and since many animals live permanently away from light under the Ross Sea shelf.

The nemertean Lineus corrugatus, the amphipods of the genus Orchomenella, small gastropods of the genera Subonoba and Ovirissoa, and the ophiuroid, Ophiacantha antarcticu. The collections of echinoderms from off Adelie Land from 0 to 60 m contained 1 100 specimens of Sterechinus neumayeri (85% of all the echinoids collected) and 736 specimens of Odontaster validus (87% of all the asteroids collected) (Amaud, 1964). R. K. DELL FIQ. 2. Typical distribution patterns of some wide-ranging invertebrates essentially confined to the Antarctic Region (data from Pawson, 1969b, Fell, Holtzinger and Sherraden, 1969, Squires, 1969, Kott, 1969b, Dell, 1969, Hedgpeth, 196913 and Dearborn and Rommel, 1969).

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