1.
Shell dark brown; half ovate; broad obliquely truncated, and scarcely notched behind; covered with close regular very thin denticulated concentric lamina, forming a paler external coat.

The front ear rather produced, with a distant inferior notch; internally pearly, with a broad brown margin on the lower-edge.
Inhab.

North and West coasts of Australia.
2.

SPATANGUS ELONGATUS, pl.6.f.

2.
Body elongate, cordate, with a deep anterior grove and notch; covered above with minute hair-like spines, with scattered very elongated tubular minutely striated spines on the sides; the anterior groves and circumference of the vent with larger equal hair-like spines on each side; the under surface with a triangular disk of similar spines beneath the vent, and with elongated larger tubular spines.
Inhab.