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Euvondrea genus novum
Disc clothed above by imbricating, naked scales which resemble petals, since the distal margins are upturned; centrodorsal and primary radials in the form of a 5-petalled Tudor lose, surrounded by three circlets of petal-like plates, the outer circlet comprising the broad radial shields, together with a single strap-shaped plate in each interradius; the plates of
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Fig. 1. —Ophiosteira bullivanti n.sp., seen obliquely from above. Figs. 2, 3, Euvondrea floretta n.g., n.sp., disc and basal arm-joints in dorsal aspect (Fig. 2) and lateral aspect (Fig. 3). Figs. 4, 5, 6, Glaciacantha jason n.g., n.sp. in dorsal view (Fig. 6), ventral view (Fig. 5), and lateral aspect of basal arm-joints (Fig. 4). All illustrations are to the scale indicated individually.
the outer circlet project well beyond the margin of the disc, which appears thus to bear a floret on its upper surface; interradial areas below covered each by four parallel, imbricating, strap-like plates, inclined obliquely outwards and upwards, each extending from the oral shield to the margin; genital clefts very narrow, extending from the oral shield to the margin; oral shield sub-circular, concave, patterned with a series of concentic circular grooves; jaw small, deeply sunken, bearing thick oral papillae which are confluent with
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the scales of the oral tentacle-pore; no arm-comb; upper arm-plates tumid, contiguous, each bearing a conspicuous erect, conical tubercle; um-spines minute; no tentacle-pores; no distal arm-hooklet.
Type Species. Euvondrea floretta n.sp.
Euvondrea floretta n.sp. (Figs. 2, 3)
Oral papillae 4; no genital scales; upper arm-plates twice as high as long; lateral arm-plates broadly contiguous below, but not above, each bearing 4 short, conical arm-spines on the distal, tumid margin, one placed alone, high on the plate, the other three together lower down; lower arm-plates twice as broad as long, triangular, with a distal base and an obtuse proximal apex, widely separated.
Type Locality. N.Z. Oceanographic Institute Station A523, 5/2/1960, 73° 34° S., 175° 47′ W. to 73° 31′ S., 175° 34′ W., 1,375 m, Pennell Bank, Ross Sea, J. S. Bullivant.
Holotype. In the collection of the N.Z. Oceanographic Institute, Wellington, R ca. 20 mm. r 4.5 mm. Colour in spirit, brown.
Remarks. The extraordinary structure of the disc of this beautiful ophiuroid sets it apart from any known genus. The character of the arms, however, recalls two other Antarctic genera, Ophiurolepis and Ophiosteira. A similarity to Ophiurolepis tumescens Koehler is evident in the young stages of Euvondrea; these will be described in the official report of the expeditions. The name Euvondrea, which is to be treated as a feminine noun of the first declension, is formed by anagram from the name of the H.M.N.Z.S. Endeavour, by which all specimens were obtained.