. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 320 DISCOVERY REPORTS usually somewhat more prominent. These ventral plates have no elevated knob, but usually show a fairly distinct concentric striation. The buccal plates are small, oval, more or less irregular, sometimes with the proximal part separated off as a distinct small plate. Adoral plates and jaws elongate, oval. Mouth papillae of the usual square shape. First ventral plate large, with a rounded inner edge and a nearly straight outer edge. It is distinctly separated from the second
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 320 DISCOVERY REPORTS usually somewhat more prominent. These ventral plates have no elevated knob, but usually show a fairly distinct concentric striation. The buccal plates are small, oval, more or less irregular, sometimes with the proximal part separated off as a distinct small plate. Adoral plates and jaws elongate, oval. Mouth papillae of the usual square shape. First ventral plate large, with a rounded inner edge and a nearly straight outer edge. It is distinctly separated from the second ventral plate; also all the following ventral plates are separated. They have a rather sharp angle proximally, the distal edge being lightly convex or a little produced in the middle. The proximal part of each joint on the ventral side in larger specimens sunken, the distal part correspondingly raised, giving a some- what ladder-like appearance. The dorsal arm plates about hexagonal, contiguous, each plate rising into a rather sharp central knob, or there may be two or three serrations on the top. The arms on the whole conspicuously keeled, triangular in section. Usually two rather sharp, often somewhat outstanding arm spines, the lower one placed close to the two spine-like tentacle scales, the upper one a little distance above. The genital slits are very short, not extending beyond the end of the first lateral plate; the interradial side of the slit carries about four well-developed, square papillae, the adradial edge is raised into a sharp keel, without indication of papillae. In continuation of the genital slit there are a varying number of small spine-like granules which continue along the sides of the arms to the dorsal side along the distal edge of the radial shields, forming thus a rudimentary arm comb. Colour in alcohol whitish. All the specimens are covered with a thick, irregular layer of a sponge, which, according to the kind information of Mr Burton, is the same sp
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
