| Navicella. | |
| Neritìna | Nerìta, Nerite, or hoof-shell. |
| Nerìta | Nerìta. |
| Natìca | Nerìta. |
"You will recollect that the order Trachelipoda is still continued.
"Navicella is a foreign genus from the Indian rivers.
NERITINA.
NERITA.
"Neritìna is a pretty genus of shells, from the European, the East and West Indian rivers. They resemble the Nerìta genus, but are all fresh-water shells; thin, smooth, and variously marked; without any tooth or notch on the right-margin of the aperture.
"N. virginea is common in collections; it is marked with various lines and dots.
"N. fluviatilis is common in our rivers: you may find plenty in river-sand, of red and brown colours, and various sizes.
"N. zebra and N. meleagris are also pretty shells. The little Neritìna viridis, from the West Indian streams, is one of the smallest species, of a pale pellucid green.
"Nerìta is a marine genus. The shells are solid and semi-globose; the left-margin is truncated, the right-margin toothed, or crenulated. This genus is never umbilicated.