Four species of this genus are recorded here from the deep-water of Cook Strait, three of these, S. cf. S. seminudus, S. potens and S. japonicus, being new records for the New Zealand region, while one species, S. arcticus, previously recorded from the region as a larval stage, is now shown to occur also in the Bay of Plenty, over the Chatham Rise and off the coast of Otago.