All terrestrial shells in this genus, taken from the Linnæan Helix on account of the peculiarity of the shell, which is orbicular, more or less flat on the upper part; the circumference of the shells constantly carinated or sub-carinated; aperture ovate, transverse, contiguous to the axis of the shells; outer lip sub-angular, sometimes toothed within. Carocolla acutissima. C. albilabris. C. angistoma. C. labyrinthus. C. lucerna. C. inflata. C. Gualteriana. C. bicolor. C. Mauritiana. C. Madagascariensis. C. marginata. C. lychnuchus. C. planata. C. planaria. C. hispidula. C. lapicida. C. albella. C. elegans. _C. lapicida._ The stone Carocolla. Pl. 19, fig. 1. Species discoid, very umbilicated; edges thick, but not toothed; beautiful bands. _C. elegans._ The elegant Carocolla. Species with a conical spire a little elevated, the base flat, the aperture square, with sharp edges. _C. labyrinthus._ The winding Carocolla. Species discoid, umbilicated, with the aperture toothed. 3. Anostoma. Two species. An extraordinary shell, sometimes called the antique lamp from its form. Shell orbicular, the spire convex and obtuse; aperture round, toothed within, grinning, turned upward to the spire; margin reflected. Anostoma depressa. Anostoma globulosa. _A. depressa._ The depressed Anostoma. Sub-globular, depressed and sub-carinated in its circumference, not umbilicated; aperture round, the margin continued by a callosity, toothed, thickened, and turned towards the back of the shell. _A. globulosa._ The globular Anostoma. Globose, with two small punctures, one on each side of the lip; slightly carinated, smooth, and white; margin reflected. 4. Helicina. Four species. A terrestrial shell, distinguished from the Helix by its transverse callous columella; depressed and diminished in thickness at the lower part. Shell sub-globular or conoid, spire low, a little depressed; aperture semi-ovate, modified by the last turn of the spire; the edge of the aperture sharp or a little reflected in a roll, the left edge enlarged at its base in a large callosity, which entirely covers the umbilicus and joins obliquely with the columella, which is twisted and a little projecting; the operculum horny, complete, sometimes calcareous externally. Helicina Neritella. H. striata. H. fasciata. H. viridis.