408.
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-- This species is very distinct from Bulla striata, Lister.Conch.t.

714.
f.72.with which it has been generally confounded; it is of larger size and perfectly smooth.
93.

Bulla hyalina (n.s.) Testa ovata cylindrica imperforata tenuis hyalina albida laevis concentrice subrugosa; apice incrassato.
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-- The shell ovate, cylindrical, thin; hyaline white, smooth, very slightly concentrically rugose; the vertex thickened, not perforated; the aperture rather longer than the shell; the inner lip slightly reflexed; axis five-twelfths, diameter three-twelfths of an inch.
94.