| Umbrella | Crepidula | Fissurella |
| Mediterranea. | unguiformis. | nimbosa. |
The Fissurella very much resembles our limpet, but differs from it by having a small, rather oval-formed hole in the summit of the shell, affording a passage to a small canal through which the water is discharged, after having passed over the branchiæ.
The Hungarian Bonnet Shell,
([Pileopsis Ungarica].)
The Pileopsis Ungarica is extremely elegant both in its form and markings; it is of a delicate white, slightly tinged, internally, with rose-colour. The animal attaches itself to rocks, between high and low water mark, and very rarely, if ever, changes its situation, unless removed by accident, when it is driven about by the waves, until the creature, being thrown on a rock in a favourable situation, attaches itself firmly to the surface.
Pileopsis Ungarica.
The Scaly Chiton, ([Chiton squamosus].)
The Chitons differ so much from all other shell-bearing animals in the arrangement of their shelly covering, that they have been placed by different naturalists in various parts of their system. Lamarck, in referring to these animals, has placed them near the end of the Mollusca.