Circospathis = Shell with verticils around the spines; κίρκος, σπαθίς.
Circogonia = Polyhedron with circles of pores; κίρκος, γωνία.
Circorrhegma = Shell with circles of fissures; κίρκος, ῥῆγμα.
Circostephanus = Shell with circular coronets; κίρκος, στέφανος.
Tuscarora, named from the American ship "Tuscarora," commanded by Captain Belknap, which made a splendid series of deep-sea soundings in the Pacific Ocean in 1875.