Some shells of this genus are highly valued for their beauty and rarity.
Shell orbicular, involuted almost in the same plane; Planorbis-shaped;
the spire of the right side very depressed; umbilicus large and conical,
with edges denticulated or not at the entrance; aperture not modified by
the last whorl of the spire, which is entirely flat; no columella.
Solarium perspectivum.
S. granulatum.
S. lævigatum.
S. stramineum.
S. hybridum.
S. variegatum.
S. luteum.
_S. perspectivum._ The perspective Solarium. Pl. 23, fig. 4.
Species very carinated in their circumference; the aperture square;
umbilicus large and crenated; colour yellowish, with brown and white
bands on the sutures of the volutions.
_S. variegatum._ The variegated Solarium.
Species sub-carinated, aperture sub-orbicular.