(Brandt, 1906)
Diagnosis: Subconical, elongate bowl. Suboral zone with one incipient to well-defined ring. With incipient to slender pedicel. Skirt without wrinkles. Second ring observed in some individuals (X. cymatica 5) may be related to the formation of epilorica.
Ref.: Brandt (1906-1907), Laackmann (1910), Jörgensen (1924).