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.  Western Australia.

Having only a single specimen completely covered with spines, it is impossible to describe the form of the ambulacra or the disposition of the tubercles.  The lower figures represent the mouth and vent of the animal in detail.

* * * * *

Description of some new Australian LEPIDOPTEROUS insects
by Edward Doubleday, Esq., F.L.S., etc.

THYRIDOPTERYX NIGRESCENS, pl. 5. f. 1.

Head densely clothed with long whitish hairs; thorax and abdomen with black hairs; wings hyaline, the nervures and nervules brown, with a few black scales:  base of the anterior and abdominal fold of the posterior more or less covered with black hairs; antennae and legs fuscous brown.

Exp. 10—­12 lines.

The larva of this species forms a dwelling for itself, similar in form and structure to that of its American congener, the EPHEMERAEFORMIS, Steph.

CALLIMORPHA SELENAEA, pl. 5. f. 2.

Wings of a brilliant silvery white; the anterior traversed by a fulvous band commencing at the base on the costa, which it follows for about one-third of its length, then crossing the wings directly to the anal angle, where it unites with a vitta of the same colour, extending from the angle nearly to the base along the inner margin; this vitta is bordered interiorly with thickly placed black dots; the transverse portion of the fulvous band is bordered on both sides with black, and has a sinus about the middle; cilia fulvous; posterior wing with a black spot near the outer angle:  below, the wings are white, except the cilia of the anterior, and a large blotch, red anteriorly, black posteriorly, near the outer angle; head rufous; antennae fuscous; thorax and abdomen white, the former with the shoulders rufous.

Exp. 2 1/2 inches.

CHELONIA PALLIDA, pl. 5. f. 3.