A molluscous animal, without any testaceous covering, and much resembling the genus Clio. Inhabits the Indian seas. One species.
- Pneumodermon Peronii.
FAMILY II.
Phyllidiacea. Six genera.
1. Genus Phyllidia. Pl. [IX].
A mollusca similar to the preceding genus, without a shell, but its back covered with a rough or coriaceous skin. Inhabits the Mediterranean. Three species.
- Phyllidia varicosa.
- P. pustulosa.
- P. ocellata.
2. Genus Chitonellus. Pl. [IX].
Animal. Body creeping, elongated; middle of the back provided its entire length with a detached, multivalve shell; the alternate pieces for the most part longitudinal; sides naked; branchiæ disposed around the body; foot cleft longitudinally by a deep furrow.
Shell. Each valve with striæ radiating from its apex; the margins serrated; the base of the last valve obtuse. The testaceous plates of this genus are never joined like those of the Chiton, so that the animal can move in every direction. Upon the contraction of the animal after death, however, these valves become nearly united. Inhabits the seas of New Holland. Two species.
- Chitonellus striatus.
- C. larvæformis.