The characteristic distinctions of this shell were first pointed out by
De Blainville.
Shell elongated, very depressed; the summit greatly post-medial, and
evidently inclined behind; aperture as large as the shell; the lateral
edges straight and parallel, the posterior rounded, the anterior sharp
and notched in the middle; muscular impression large, elongated oval,
slightly open in front.
Parmophora Australis.
P. brevicula.
P. granulata.
_P. Australis._ The Australian Parmophorus.
Shell oblong, depressed; vertex slightly recurved; striated
concentrically; one margin rounded, and the other truncated.