Pharyngella = Shell with an internal pharynx.
Porcupinia, in memory of H.M.S. "Porcupine" by which the first British deep-sea explorations were carried out during the years 1869 and 1870.
Cortinetta = Diminutive of Cortina.
Medusetta = Small Medusa.
Euphysetta = Diminutive of Euphysa (a Medusa).