"C. annulus, the ring-cowry, has a yellow mark round the top of the shell. The fowl-cowry, C. moneta, is used for money by the natives of Siam and Bengal.
"C. pediculus is changed to Trivia, a new sub-genus from Cypræa. We find the following characters:—form of the columella internally concave, ribbed; shell sub-globular, cross-ribbed. T. carnea, flesh-coloured shell; thin, pure rose-coloured, with very thin, distant ribs; lips whitish: it has sometimes an indistinct dorsal groove.
"Trivia Europæa (Cypræa of authors) is a globose shell, ash or flesh-coloured, with three black dots and a whitish dorsal streak; ribs close, rather thick, and whitish; base white; outer lip wide. The variety has the back without spots. T. pediculus has six square dorsal spots; the colour of the shell pale red; ribs rather thick-covered; dorsal line narrow; base reddish. Only one species, C. Europæa (or Trivia) is a native of our shores.
"There are several fossil species of Cypræa.
"We now pass on to a genus in which there is but one recent species, Terebellum subulatum, Bulla of Linnæus. (See Frontispiece.) A fossil Terebellum is found in London clay.
ANCILLA.
CONUS.
"The Oliva genus contains smooth, shining shells, common, and therefore little valued; nevertheless they are beautiful, and of various colours.
"The columella is obliquely striated; the aperture longitudinal and straight. The olives were placed by Linnæus among the Volutæ, on account of the striæ on the columella, without regard to the peculiarity of the canal, by which the olives are known from all other shells. This canal separates the volutions of Oliva. Many species are prettily marked by nature, others are rendered handsome by polishing. O. subulata is small, and pointed like a mitre. The common olive is white, with brown, waved lines. O. irrisans is ornamented with yellow zigzag lines: it has two brown zones. O. oriza, the little rice-olive, is white.
"I should have noticed the small genus Ancilla, formerly Ancillaria, which is very near both to Terebellum and Oliva. The columella has a varix at the base, which distinguishes it from Terebellum, and it wants the canal which separates the volutions of Oliva.