usco tincto, margine acuto,
arcuato.

Long. 6 lines, lat. 3 lines.

Habitat. Arnhem's Land (Coll. Angas.)

A pale horn-coloured, somewhat solid species, with a moderately elevated
spire, acute (not eroded) at the apex, and with the terminal whorls
sometimes papillary.

11. Physa (Ameria) reevii, Adams & Angas.

P. testa ovali, postice abrupte truncata, imperforata, cornea; spira
plana, tenui; anfractibus quatuor, planis, ultimo permagno, postice acute
angulato, transversim obsolete striato; apertura oblongo-truncata; labio
antice valde tortuoso; labro postice angulato.

Long. 6 lines, lat. 4 lines.

Habitat. Arnhem's Land (Coll. Angas.)

We have much pleasure in dedicating this singular species to Mr. Lovell
Reeve, who has evinced much interest in the shells of this group. The
last whorl is acutely angulate posteriorly, and the spire is tabulated,
giving to the shell a peculiar truncate appearance.

12. Physa (Ameria) bonus-henricus, Adams & Angas.

P. testa ovata, rimata, tenui, cornea; spira vix elata, plana;
anfractibus tribus, planis, postice angulatis, ultimo magno, inflato,
ventricoso, postice subangulato, longitudinaliter plus minusve plicato;
apertura ovata; labio tenui, subtortuoso; labro simplici, margine
arcuato.

Long. 4 lines, lat. 2 1/2 lines.

Habitat. Arnhem's Land (Coll. Angas.)

This is a small inflated species, with a short truncate spire. We have
dedicated it to the founder of the section Ameria, a gentleman well known
for his deep researches in conchology.

13. Unio (Alasmodon) stuarti, Adams & Angas.

U. testa transversim elongato-ovata, tenui, compressa, epidermide
olivaceo-fusca induta, postice corrugato-plicata, latere antico breviore
rotundato, postico longiore oblique subtruncato, margine ventrali
regulariter arcuato; umbonibus parvis, erosis, dentibus cardinalibus
elongatis valde divergentibus, postico bifido, antico prominulo; intus
iridescente.

Alt. 1 1/2 inch, lat. 3 inches 2 lines.

Habitat. Lagoon, Mount Margaret, Central Australia (Coll. Angas.)

This species, which we have named after Mr. J. McD. Stuart, the leader of
the expedition, is the only Naiad, besides Alasmodon angasana of Lea, yet
discovered in the regions traversed by the explorers.

...

Description of a new Helix from the interior of Australia, by Dr. L.
Pfeiffer.

Helix perinflata, Pfr.

T. umbilicata, globosa, solida, striis incrementi rugosis et lineis
impressis antrorsum descendentibus d