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Published by means of the yank Geophysical Union as a part of the Antarctic study Series.
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Extra info for Biology of the Antarctic Seas XIV
Furrows may accumulate fine debris and retain cuticle (Figure 57). No fosse. Base. Pedal disc reddish brown, usually concave, wrapped around bolus of sand or mud (Figure 56) so that only a small, central opening remains, or around elongate object. Rarely slightly flared. Tentacles and oral disc. Tentacles arise at margin; 67 counted in two individuals, all about the same size. Stubby, tip pointed, with greatly thickened mesoglea on aboral side, often elongate along oral/aboral axis; in one tentacle 7 mm long, 3 mm of 4 mm width was mesoglea; some tentacles only a few mil limeters long and nearly as wide.
Metrical siphonoglyphs that are considerably longer than actinopharynx. Actinopharynx tan to reddish brown, shallowly sulcate; about a third of the column length. Sphincter muscle mostly in center of mesoglea but may near one side or other at tapered basal end; narrow (25% or less total width of mesoglea in central portion) and long, extending into scapus; not very strong. Consists of small, scattered alveoli that may be transversely stratified (Figure 59). Ten tacle longitudinal musculature mesogleal to mesoectodermal, most highly developed on oral side.
Diffuse retractor muscles short, weak (Figure 62); parietobasilar muscles poorly developed although may be wide at proximal end of body. Sphincter muscle mesogleal, moderately strong. Quite variable, probably related to state of expansion of animal: typically long, 30 mm long in one animal 70 mm long, but extends only to scapus in some; may oc cupy nearly entire width of mesoglea at margin (Figure 63) and taper proximally, but narrow throughout in others; muscle bundles dense or sparse, of equal or unequal size.