ong, turned and closed at
the ends; the surface is deeply radiately ribbed; the ribs are
concentrically rib-striated, which gives their sides a denticulated
appearance; the edge is crenulated, and the umbones are acute, a small
distance apart, and nearly in the centre of the hinge margin, which is
straight.

25. Pinna dolabrata, Lam. Hist. 6 pt. 1 133.
Pinna bicolor, Chemn. Conch. Cab. t. 90. f. 234.
Icon. Chemn. 8 t. 90. f. 780 ?

The shell, figured by Chemnitz, appears to be a variety of this species
with the anterior end uncurved, which has most probably been caused by
some injury on the anterior basal edge.

The species is peculiar for its yellow pearly internal coat, and purplish
rays.

2. COCHLEOPHORA.

26. Trochus caerulescens. Lam. Hist. 7 18.
Icon. Ency. Meth. plate 444. f. 2. a, b.
Inhab. South-west Coast.

Lamarck describes this shell from a specimen found by Peron.

27. Trochus noduliferus, Lam. Hist. 7 18.

28. Monodonta conica (n.s.)

Testa conica, acuta, imperforata, spiraliter striflto-costata, rufa;
costis subtuberculatis, albo-nigro-articulatis; apertura sulcata.
Inhab. -- Mus. Brit.

Shell conical, axis longer than the diameter, the whorl flattened with
six spiral raised substriae, which are transversely divided into blackish
purple beads with white interspaces, the apex rather acute; the base,
rather convex, axis imperforated; the aperture subquadrangular, inside
furrowed; the base of the columella lip with a prominent tooth and
distinct groove behind it, the upper part rugose; axis eight-twelfths,
diameter six-twelfths of an inch. This shell does not appear to be
uncommon on the coast of Australia.

29. Monodonta uranulata (n.s.)

Testa depresso-conica, umbilicata, purpurea, albomarmorata, spiraliter
papillata; papillis quadri-seriatis, umbilico laevi; infima facie
papillata, apertura sulcata.

Inhab. Mus. Brit.

Shell rather depressed, conical, purple variegated with white, generally
concentrically wrinkled, and ornamented with granulated spiral ribs, the
ribs of the upper part of the last, and of all the other whorls rather
distant, and forming four series; those of the under part rather closer,
and smaller. The axis unbilicated, smooth, the aperture roundish, the
outer lips furrowed, the columella lip smooth with a groove at its base,
axis four-twelfths, diameter five-twelfths of an inch.

30. Monodonta denticulata (n.s.)
Testa depresso-conica, umbilicata, rufa, nigro pun