- Purpura Persica.
- P. columellaria.
- P. armigera.
- P. undata.
- P. bufo.
- P. planospira.
- P. carinifera.
- P. squamosa.
- P. sertum.
- P. ligata.
- P. imbricata.
- P. bicostalis.
- P. thiarella.
- P. echinulata.
- P. unifascialis.
- P. clavus.
- P. bizonalis.
- P. Francolinus.
- P. cruentata.
- P. lagenaria.
- P. plicata.
- P. rustica.
- P. hystrix.
- P. retusa.
- P. fasciolaris.
- P. nucleus.
- P. subrostrata.
- P. patula.
- P. consul.
- P. hippocastana.
- P. mancinella.
- P. neritoides.
- P. coronata.
- P. sacella.
- P. bulbus.
- P. cariosa.
- P. Rudolphi.
- P. succincta.
- P. bitubercularis.
- P. hæmastoma.
- P. callosa.
- P. callifera.
- P. scalariformis.
- P. rugosa.
- P. textilosa.
- P. lambosa.
- P. lapillus.
- P. cateracta.
- P. fiscella.
- P. semi-imbricata.
- P. deltoides.
- P. trochlea.
- P. vexillum.
- P. distorta.
- P. tectum.
- · · · · ·
- P. engonata.*
- P. brevidens.*
- P. lapilloidis.*
- P. harpa.*
- P. Floridana.*
- P. dumosa.*
- P. macrostoma.*
5. Genus Monoceros. Pl. [XII].
Animal. As above.
Shell. Differs only from the Purpura by a long, conical pointed, somewhat reflexed tooth in the outer lip. Five species.
- Monoceros cingulatum.
- M. imbricatum.
- M. striatum.
- M. glabratum.
- M. crassilabrum.
6. Genus Concholepas. Pl. [XII].
Animal. Entirely unknown.
Shell. Wide, rough, ovate; spire very short; aperture very large, oval and sloped anteriorly; the edges united, the right very thick and dentated; muscular impression almost in form of a horse-shoe; operculum horny and rudimentary. It was formerly considered a Patella, from which it differs by the operculum. One species.
- Concholepas Peruvianus.