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We present here a description of H. hawaiiensis, but we know of no features that separate it from H. dispar. The two species, which are found in separate oceans, have not been compared side by side, and, therefore, have not been synonymized. Hopefully, DNA data will tell us before long if careful morphological comparisons are needed. H. dispar has priority but our access to specimens in excellent condition and illustrations of H. hawaiiensis is responsible for presenting a more complete description of this species.