AUSTRALIAN MALACOSTEACA. 147 



This species is a close ally of P. japonica, De Haan, but 

 differs from it in having but two teeth on the anterior border of 

 the carpus of the anterior legs and other points ; it is distin- 

 guished from P. elonc/atits, as figured in the Voyage of the 

 " Erebus and Terror," by having all the limbs much more slender. 



Sub- Genus Petrocheles, Miers 



Sides of the rostrum spinose. Lateral margins of the carapace 

 with a series of spines. Anterior legs elongated, slender, arm 

 with a series of spines on the anterior margin. 



277. Petrocheles australiensis. A.M. 

 Petrocheles australiensis, Miers, Cat. Crust. N.Z., p. 61 (1876). 

 Carapace depressed, lateral margins with a series of ten or 



eleven small spines. Front prominent, lateral margins with 

 three or four spinules ; two spines on the carapace at the base 

 of the front. Two longitudinal series of eight spines each on 

 the upper and posterior surface of the arm, the upper margin of 

 the mobile finger spinulous. [M.] 

 Mordialloc, Victoria. 



Genus Porcellana, Lamarck. 



Carapace usually convex, as broad as long, sometimes broader, 

 sub-orbicular and depressed above. Peduncle of the antenna? 

 cylindrical, not crested, first joint extending to the margin of 

 the carapace. 



278. Porcellana biunguiculata. A.M. 



Porcellana biunr/uiculata, Dana, U.S. Explor. Exped., Crust, 

 i., p. 411, pi. xxvi.', fig. 1 (1852). 



A little transverse, very convex and sub-globose, smooth 

 front as seen from above straight. Anterior feet of moderate 

 size ; carpus more than twice as long as broad, entire, smooth 

 and smooth, obsoletely punctate, wholly naked, fingers very 

 much gaping, the superior quite regularly and largely arcuate. 

 Following feet naked, or very nearly so, tarsus short ; profoundly 

 two-clawed. \_D.~\ 



Holborn Island, off Port Denison, 20 fathoms (Mr. Alex. 

 Morton). 



