The connecting genus between those shells that have a columella and
those that are evolved upon their own axis. Distinguished from the
Marginella by not having a thickened outer lip. The shells are marine,
and generally very small.
Shell cylindrical, convolute; spire obsolete or concealed; aperture
narrow, the whole length of the shell, with one or more plaits on the
columella at the lower part.
Volvaria monilis.
V. pallida.
V. triticea.
V. oryza.
V. miliacea.
_V. monilis._ The Necklace Volvaria. Pl. 29, fig. 5.
Species greatly involuted; aperture very narrow and very long; plaits on
the anterior part of the columellar edge; the exterior edge thin.
FAMILY XX.
CONVOLUTA. Six genera.