The mollusca are animals with soft bodies, enveloped in a muscular skin, and usually protected by a univalve or bivalve shell. […] The univalve mollusca are encephalous, or furnished with a distinct head; they have eyes and tentacula, and the mouth is armed with jaws.
Source: wiktionary
Turning for a very brief space to animals: on the land there are some hermaphrodites, as land-mollusca and earth-worms; but these all pair.
Source: wiktionary
The amphibious animals are provided with special organs for the sense of smell, although a very delicate sense of smell is likewise met with among the crustacea, such as crabs, mollusca and insects.
Source: wiktionary
Probably frogs, crabs, mollusca, and insects form their chief diet; […]
Source: wiktionary
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