23.  Pecten asperrimus, Lam.  Hist. 6 pt. 1 174.

This beautiful species was originally found by MM.  Peron and Lesueur on the coast of Van Diemen’s Land.

24.  Lima minuta (n.s.)

Testa ovato-oblonga valde tumida clausa radiatim costata, costis transverse costato-striatis, auriculis minutis, margine crenato.

This shell, which was brought up by the deep sea sounding-lead, being only one-sixth of an inch long, and one-fourth high, is the smallest species of the genus.  It is white, ovate, oblong, 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.