Clausilia torticollis. C. truncatula. C. retusa. C. costulata. C. corrugata. C. inflata. C. teres. C. denticulata. C. collaris. C. papillaris. C. plicatula. C. rugosa. _C. lævis._ The smooth Clausilia. Pl. 19, fig. 3. A regular type of this genus. _C. papillaris._ The pimpled Clausilia. Pellucid, finely striped longitudinally, the margins of the volutions papillose; aperture with two plaits; brownish colour. 7. Bulimus. Thirty-four species. The shells of this beautiful genus are all terrestrial, and differ from the Helix and Bulla of Linnæus in never being of an orbicular shape. The animals inhabiting them are said to be oviparous, and have eggs nearly as large as those of a pigeon. Shell oval, oblong, sometimes sub-turriculated; the summit of the spire obtuse, and the last turn much greater than all the others taken together; aperture oblong oval, the edge disunited; the right reflected outward in adults; the columella smooth, with an inflection in the middle, at the point of junction of the columella with the mouth of the aperture which it forms. Bulimus ovatus. B. hæmastomus. B. gallina sultana. B. zigzag. B. undatus. B. ovoideus. B. interruptus. B. Peruvianus. B. Favannii. B. Kambeul. B. calcareus. B. decollatus. B. Lyonetianus. B. inflatus. B. radiatus. B. fragilis. B. Guadaloupensis. B. Richii. B. inversus. B. citrinus. B. sultanus. B. Pythogaster. B. Mexicanus. B. multifasciatus. B. Bengalensis. B. Caribæorum. B. octonus. B. terebraster. B. articulatus. B. acutus. B. ventricosus. B. montanus. B. hordeaceus. B. lubricus. _B. montanus._ The mountain Bulimus. Ovate oblong, umbilicated, slightly striated longitudinally, with several convex volutions; aperture semi-oval; brownish colour; outer lip white and reflected.