onvexa rugoso-plicata aurantio-rubens spiraliter
costata, costis tuberculato-muncatis, fauce margaritacea, spira retusa.
Icon.

Shell ovate-oblong, convex, externally transversely rugose, plaited and
spirally ribbed; the ribs concentrically striated and furnished with
numerous raised scale-like tubercles; the row of perforations scarcely
round contains ten or twelve rather large holes; the spire slightly
raised, very near the edge, consisting of two or three very
rapidly-enlarging whorls; the inside concave, showing the external ribs,
reddish pearly; the columella lip narrow, depressed, bent; the outer lip
thin, strait, or cut out; the imperfect perforation about one-fifth the
length of the outer lip from the end of the columella lip; length two,
breadth one inch and a quarter.

This species is very distinct on account of its long form, and curved
lower face, as well as its outer surface.

106. Haliotis marmorata, Lin. Sys. Nat. 1256.
Icon. Martini. 1 t. 14. f. 139.

107. Padollus rubicundus, De Montfort, Syst. 2 115.
Padollus scalaris, Leach, Zool. Misc. 1 66.
Haliotis tricostalis, Lam. Hist. 6 2. 218.
Icon. De Montf. 2 t. 114. Leach, l.c.

This specimen, which is the largest I ever saw, measures three inches and
a half by two and a half. It was found upon Rottnest Island, on the West
Coast.

PTEROPODA.

108. Janthina fragilis, Lam. Syst. Anim.
Janthina communis, Lam. Hist. 6 2. 206.
Helix janthina, Lin. Sys. Nat. 1 1246.
Icon. Lister. t. 572. f. 24. Chemn, 5 t. 166. f. 1577, 1578.

Several specimens of this shell were taken by the towing-net in the
Indian Ocean, on the passage from the Coast of New Holland to Mauritius.

109. Janthina exigua, Lam. Hist. 6 2. 206.

Two or three species of this shell were presented to the Museum by Mr.
Hunter, the surgeon to the expedition; it is proved to be very distinct
from J. fragilis, from the description of its float by Dr. Coates in the
transactions of the Society of Natural Science of Philadelphia. See
Annals of Philosophy for 1825, page 385.

110. Hyalaea tridentata, Lam. Hist. 6 1. 286.
Monooulus telemus ? Lin. Syst. Nat. 1 1059.
Anomia tridentata, Forsk. Faun. Arab. 124.
Icon. Forsk. Faun. t. 40. f. b. Chemn. 8 Vign. 13. Cuv. Ann. Mus. 4 t.
59. Anatomy.

CEPHALOPODA.

111. Spirula fragilis, Lam. Syst. Anim. 102.
Spirula australis, Lam. Ency. Method. 465. f. 5. a. b.
Spirula peronii, Lam. Hist. 7 601.
Nautilus spirula, Lin. Syst. Nat. 1163.
Nautilus spi