pediculus. C. oryza. C. coccinella. C. Australis. C. albella. _C. exanthema._ The measly Cypræa. Species oblong-ovate, brown, with round white spots; dorsal line grayish; marginal teeth brown; spire not quite concealed. _C. Pantherina._ The Panther Cypræa. Pl. 31, fig. 4. Species regular, beautifully spotted like a panther. 3. Terebellum. One species. Shell convolute, thin, shining, sub-cylindrical, pointed behind, truncated before; aperture longitudinal, edges entire, columella truncated. _T. subulatum._ The awl-shaped Terebellum. Pl. 31, fig. 3. Answers to the above description, being the only living species known. 4. Ancillaria. Four species. An intermediate genus between the Terebellum and the Oliva; distinguished from the former by a callous oblique band at the base of the columella; and from the latter by not having the spiral whorls separated by a groove. Shell smooth, oval, oblong, pointed behind, enlarged and truncated before; the columella covered anteriorly by a callous oblique band; the right lip obtuse. Ancillaria cinnamomea. A. ventricosa. A. marginata. A. candida. _A. cinnamomea._ The cinnamon Ancillaria. Pl. 30, fig. 5. Species with spire nearly obsolete; shell chestnut colour, with white bands; varix of the columella reddish and somewhat striated. 5. Oliva. The Olive. Sixty-two species. An oval, involuted, internal shell, distinguished from the Ancillaria by a narrow canal continued from its upper angle around the sutures of the spiral whorls. It was formerly classed with the Voluta, which genus has not the canal, so that they cannot be mistaken for each other. There is a callosity uniting with the spiral canal, and another at the base of the columella. Shell thick, solid, smooth, oval, elongated, sub-cylindrical; the spiral whorls very small, separated by a canal; aperture long, narrow; the columellar edge reflected anteriorly by a callosity, and striated obliquely through all its length. The shells are generally clouded or covered with waved lines of a brownish colour, more or less dark.