_H. Neritella._ The Nerite-shaped Helicina. Pl. 19, fig. 4. Species yellowish white, finely striated, the edge reflected in a roll. _H. striata._ The striated Helicina. Globular, striated, the right edge sharp, but reflected; the umbilical callosity rather thick, the operculum calcareous and solidified by a marginal roll and a vertical crosspiece. 5. Pupa. Twenty-seven species. These shells are generally very small, some not more than an eighth of an inch in length; chiefly terrestrial. Shell cylindrical, elongated, or sub-globular, ordinarily ventricose: summit obtuse; the turns of the spire numerous, almost equal; aperture round or oval, with margins almost equal, expanded, reflected; one or two plaits on the columellar edge, and several teeth, varying in number on the right margin. Pupa mumia. P. uva. P. sulcata. P. candida. P. labrosa. P. fusus. P. tridentata. P. fasciolata. P. quadridens. P. polyodon. P. variabilis. P. frumentum. P. secalis. P. zebra. P. unicarinata. P. maculosa. P. clavulata. P. ovularis. P. Germanica. P. cinerea. P. tridens. P. avena. P. granum. P. fragilis. P. dolium. P. umbilicata. P. muscorum. _P. Lyonetiana._ Lyonet’s Pupa. Pl. 18, fig. 5. Species cylindrical, obtuse, aperture compressed and distorted by the last whorl in its adult state making suddenly a gibbous inflection to the left. _P. muscorum._ The moss Pupa. Species very small, oval or more or less spherical, obtuse, light brownish colour; aperture large, with one tooth; volutions convex; outer lip white and reflected. _P. mumia._ The double-toothed Pupa. Pl. 19, fig. 2. Species cylindrical, obtuse at both ends, aperture semi-ovate, with two teeth. 6. Clausilia. Twelve species. Remarkable for having the termination of the lower whorl quite detached from the base of the shell. Shell cylindrical, elongated, a little ventricose in the middle, generally fusiform, summit obtuse, the last turn smaller than the preceding; aperture small, irregular, oval; at least one plait, posterior to the columella, increasing with age so as to be separated, and forming at the posterior angle of the aperture a rounded sinus.