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Published through the yank Geophysical Union as a part of the Antarctic study Series.


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Carlgren, 1949, p. 81. Sicyonis antarctica: Carlgren, 1939, p. 795; 1949, p. 81. Description Body form and size. Column cylindrical (Figure 23), sometimes with circumferential constriction, so hourglass shaped, or tapering slightly toward basal end; those examined mostly 50-60 mm long and nearly as wide (but as small as 10 mm across). Body wall smooth except for shallow, irregular furrows; few specimens retain brownish or reddish brown ectoderm, most only in shallow wrinkles near pedal end; column white to pinkish in absence of ectoderm.

Because of these traits, a vagile nature, and catholic diet [Dearborn, 1977; Pratt and Dearborn, 1984], 0. victoriae is widely distributed and reaches high local densities. Species of Ascothorax Djakonov live within the genital bursae of their ophiuroid hosts. A partial revision of the genus with descrip­ tions of several new species has been produced recently [Grygier, 1983c]. Other taxonomic references on Ascothorax are Djakonov [1914], Stephensen [1935], Wagin [1947, 1968], and Heegaard [1951].

Only in the possession of mesoectodermal longitudinal tentacle muscles, rather than ectodermal ones, does A. plebeia depart from Stephenson's [1920b] and RiemannZiirneck' s [1978b] definitions. This is a minor matter, easily remedied by rephrasing to include that possibility. Doumenc [1975] questioned whether Actiner­ nus plebeius might be synonymous with the North Atlantic species Actinoscyphia saginata. Data from USARP specimens and from RiemannZiirneck' s [1978b] redescriptions prove that the species are distinct.

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