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Inhab. Western Australia, near Swan River. The Port Essington Cray-fish. ASTACUS BICARINATUS, t. 3.f. 2.

Ears moderate, naked, rather pointed at the end; nose-leaf large, central process small, scarcely lobed, blunt at the top; fur elongate, soft, bright orange, the hairs of the back with short brown tips, of the under side rather paler, of the face rather darker; female pale yellow, with brown tips to the hair of the upper parts. Inhab. Port Essington, near the Hospital, Dr. Sibbald, R.N.

Pale grey, back and sides, marbled with symmetrical dark-edged spots, those of the middle of the back being generally confluent, of the face elongate, band-like; the legs dark-banded, beneath white. Inhab. Port Essington. Somewhat like DISCOGLOSUS PICTUS in appearance. The internal nostrils are far apart, with an elongate group of palatine teeth level with their hinder edges.

AVICULA LATA, pl. 6. f. 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.

Inhab. Van Diemen's Land. Mr. Madagascar appears to be the tropical confines of the genus. The Western Australia Cray-fish. ASTACUS QUINQUE-CARINATUS, t. 3. f. 3.

Inhab. Van Diemen's Land. Mr. Madagascar appears to be the tropical confines of the genus. The Western Australia Cray-fish. ASTACUS QUINQUE-CARINATUS, t. 3. f. 3.

Olive, sides of the face, and body blackish brown; face varies with white streak; the sides of body marbled with unequal white spots; limbs brown and white marbled; under side of the body whitish. Inhab. Australia, on the banks of the river Murray. PERIALIA? ORNATA, t. 2. f. 2.

Olive, sides of the face, and body blackish brown; face varies with white streak; the sides of body marbled with unequal white spots; limbs brown and white marbled; under side of the body whitish. Inhab. Australia, on the banks of the river Murray. PERIALIA? ORNATA, t. 2. f. 2.

Pale grey, back and sides, marbled with symmetrical dark-edged spots, those of the middle of the back being generally confluent, of the face elongate, band-like; the legs dark-banded, beneath white. Inhab. Port Essington. Somewhat like DISCOGLOSUS PICTUS in appearance. The internal nostrils are far apart, with an elongate group of palatine teeth level with their hinder edges.

Inhab. Port Essington, Mr. Gilbert. The A. AUSTRALASIENSIS, Milne Edwards, Crust ii. 332. t. 24. f. 1 5. agrees with this species in the form of the beak, but the keels on the thorax are not noticed either in the description or in the figure; and the caudal lobes in the figure appear most to resemble A. FRANKLINII.