Idiobryssus coelus, new species. Spines and tuberculation are largely omitted in order to bring out clearly the characteristic concave petaloid area, surrounding fascicle and elevated periproct. X6+.
<dl><dd>Fig. 1. Seen from above.</dd>
<dd>Fig. 2. Seen from right-hand side.</dd></dl>
Clark, H.L. 1939. A remarkable new genus of sea-urchin (Spatangidae). <i>Allan Hancock Pacific Expeditions</i> 2(11): 173-176, Plate 17
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