. Physa newcombi, Adams & Angas.

P. testa ovata, umbilicata; spira mediocri, acuta, ad apicem integra,
cornea, viridescente aut pallide fulva; anfractibus quinque, convexis,
saepe plus minusve transversim subliratis; apertura ovata; labio reflexo,
umbilicum partim tegente; labro vix incrassato, peristomate nigrescente.

Long. 10 lines, lat. 7 lines.

Habitat. Ponds at Mount Margaret (Coll. Angas.)

We have much pleasure in naming this noble Physa after Dr. Newcomb, the
distinguished American conchologist, who has contributed so much, by his
researches in the Sandwich Islands, to our knowledge of the genus
Helicter or Achatinella. The species is widely umbilicated, and the
peristome is usually dark-coloured.

7. Physa ferruginea, Adams & Angas.

P. testa ovata, rimata, ferruginea; spira mediocri, apice eroso;
anfractibus tribus, convexis, simplicibus, transversim crebre
crenato-striatis; apertura ovata, intus purpurascente; labio tenui, late
reflexo; labro acuto.

Long. 5 lines, lat. 4 lines.

Habitat. Arnhem's Land, North-west Australia (Coll. Angas.)

This is a small ferruginous species, with the whorls finely transversely
striated.

8. Physa badia, Adams & Angas.

P. testa elongato-ovata, imperforata, solida, badia; spira elata, apice
obtuso eroso; anfractibus quinque, convexiusculis, longitudinaliter
strigillatis; apertura elongato-ovata; labio albo, excavato, lirula
antica subspirali instructo; labro arcuato, in medio producto, intus
fusco tincto.

Long. 1 inch, lat. 6 lines.

Habitat. Tributaries of Adelaide River, Arnhem's Land (Coll. Angas.)

A fine, solid, brown species, generally more or less eroded, and with a
peculiarly strongly plicate columella.

9. Physa olivacea, Adams & Angas.

P. testa elongato-ovata, imperforata, solidiuscula, olivacea; spira
elata, attenuata, apice eroso; anfractibus quinque, convexiusculis;
apertura ovato-acuta; labio incrassato, flexuoso; labro acuto, margine
arcuato.

Long. 6 lines, lat. 3 lines.

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

A neat, olive-coloured species, somewhat resembling in form the British
Aplexa hypnorum, but without the polished exterior of the latter.

10. Physa concinna, Adams & Angas.

P. testa ovata, imperforata, solidiuscula, cornea; spira brevi, acuta,
apice interdum papilloso; anfractibus quinque, convexiusculis;
transversim striatis; apertura acuto-ovata; labio incrassato, spiraliter
valde tortuoso; labro intus incrassato et f