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Updated: May 16, 2025
Being water shells, and not such common objects as land shells, these have no popular names. The river limpets are called ancylus fluviatilis. Some are no larger than a yew berry, and are shaped like a Phrygian cap; but they "stick" with proper limpet-like tenacity.
Gilbert found a new species of sleeping lizard, with four lighter stripes on the dark brown ground along the back, and with dark spots on the sides. Mr. Roper shot some ducks, and I found a species of Ancylus; besides the species of Limnaea and Paludina, which we had previously met with. Dec. 28.
Limnaea, similar to those of Europe, creep along the surface of the water; small Planorbis live on the water-plants, to which also adhere Ancylus; and Paludina, Cyclas, and Unio, furrow its muddy bottom. The latitude of this spot was 21 degrees 23 minutes S.
Along the shore were strewn shells thrown up by the surf; and on examining them, I found them all to belong to well-known old-world genera Unio, Planorbis, Ancylus, and Ampullari.
All this alluvium was evidently of fluviatile origin, for, in the interstices between the pebbles, the Ancylus fluviatilis and other freshwater shells were abundant.
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