- Parmophorus Australis.
- P. brevicula.
- P. granulata.
- P. ambigua.
2. Genus Emarginula. Pl. [IX].
Animal. Body creeping, with two, conical, tentacular eyes at the external base; mantle large, partly covering the margin of the shell; foot very large and thick.
Shell. Shield-like, conical; summit inclined; the cavity simple, having a notch or hollow cut on its posterior margin; shells of this genus are generally very small. Inhabits the British seas. Five species.
- Emarginula Blainvillii.
- E. Cuvierii.
- E. fissura.
- E. rubra.
- E. marginata.
3. Genus Fissurella. Pl. [IX].
Animal. With the head truncated in front; two conical tentacula, with eyes at their exterior base; mouth simple, terminal, and destitute of jaws; two pectinated branchiæ projecting from the cavity; mantle large, protruding beyond the shell.
Shell. Shield-shaped, conical recurved, summit entire, depressed, concave below, perforated at the summit in the form of a key hole, without a spire; the exterior surface ribbed longitudinally. Inhabits the European and American seas. Twenty-two species.
- Fissurella Cayennensis.
- F. lilacina.
- F. Javanicensis.
- F. fascicularis.
- F. rosea.
- F. Barbadensis.
- F. radiata.
- F. nodosa.
- F. nimbosa.
- F. crassa.
- F. Græca.
- F. picta.
- F. pustula.
- F. hiantula.
- F. viridula.
- F. depressa.
- F. Peruviana.
- F. gibberula.
- F. minuta.
- F. plicata.
- · · · · ·
- F. alternata.*
- F. redimicula.*