. Bulletin of the British Museum (Natural History). 43° HELMUT ZIBROWIUS (Holotype: fragment of one specimen with gill tuft, operculum and tube fragment; Paratype: fragment without gill tuft, BMNH. ). Description. Diameter of tube up to 2 mm. Tube white, thick and hard, with bright surface, subquadrangular in cross-section, with slightly dilated basal attach- ment; numerous, close, well marked, crest like, smooth transverse ridges encircling tube; transverse ridges directed sUghtly forward in midline; no longitudinal keels; longitudinal groove cutting transverse ridges into isolat
. Bulletin of the British Museum (Natural History). 43° HELMUT ZIBROWIUS (Holotype: fragment of one specimen with gill tuft, operculum and tube fragment; Paratype: fragment without gill tuft, BMNH. ). Description. Diameter of tube up to 2 mm. Tube white, thick and hard, with bright surface, subquadrangular in cross-section, with slightly dilated basal attach- ment; numerous, close, well marked, crest like, smooth transverse ridges encircling tube; transverse ridges directed sUghtly forward in midline; no longitudinal keels; longitudinal groove cutting transverse ridges into isolated lower bars near base and continuous upper bars. Length of specimens up to 19 mm, length of gill tuft up to 7 mm. 7 thoracic setigerous segments, 6 of them uncinigerous. Number of abdominal segments unknown. Details of collar structure unknown. Thoracic membranes very short, ending at about second setigerous segment. Gill tuft of about 12 filaments on each side; basal lobes long and slender; no gill membranes. Second filament on left side transformed into smooth opercular stalk, without pinnules or wings, sHghtly enlarged at base of operculum. Operculum subglobular, somewhat higher than wide, with slightly convex simple distal plate; opercular plate smooth, thin, with white calcareous deposit and two indistinct concentric Fig. I. Bathyvermilia challengeH. a: operculum; b: thoracic uncinus; seta; d, e: tube, upper side and side view. abdominal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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Keywords: ., 1973, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
