AUSTRALIAN MALACOSTRACA. 149 



others, triangular, the lateral lobes very small ; two acute teeth 

 behind the orbit, and a rounded lobe on the lateral border a 

 little further back. Carpus of chelipedes a little longer than 

 broad, smooth, with a sharp entire internal crest ; propodos 

 smooth, narrow ; fingers hooked and crossing one another at the 

 tips. Length J in. 



Port Denison, five fathoms. 



282. Porcellana triloba. 



PorceUaneUa triloba, White, Voyage of H.M.S. " Rattlesnake," 

 Appendix, p. 394, pi. v., fig. 2. 



Carapace somewhat flattened ; front produced into three large 

 teeth or lobes ; the middle lobe the widest and most prominent, 

 the sides of the outer lobes rounded ; carapace longer than wide, 

 the upper surface smooth, polished, with some transverse lines, 

 wbich are most observable in front and at the sides. Chelipedes 

 long and smooth, the finger crossing at the tips, their inner edge 

 rough, scarcely toothed ; propodos rounded, internally, keeled 

 externally, ornamented in the distal half with a thickish line of 

 hairs. 



Cape Capricorn, 15 fathoms. 



283. Porcellana dispar. A.M. 

 Porcellana dispar, Stimpson, Proc. Acad. Slat. Sci., Philad., 



x., sp. 297. 



Carapace a little asymmetrical, smooth, pubescent at the sides. 

 Lateral margin with two denticles near the middle, and armed 

 with a spinule above the insertion of the antennae. Pront nearly 

 straight, scarcely convex, acutely deflexed in the middle. Cheli- 

 pedes very unequal ; the larger smooth ; carpus angulated in the 

 middle, the anterior margin undulated ; propodos broad, naked, 

 not twisted ; fingers punctate, dactylus curved, armed internally 

 with a single tooth. Smaller chelipede with the propodos acutely 

 angulated, the outer border pubescent ; fingers much contorted 

 and curved inwards, ornamented with long hairs ; carpus bi- 

 dentate on its anterior margin the teeth obtuse. 



Port Jackson ; Port Stephens. 



A very common species in Port Jackson. The asymmetry of 

 the carapace described by Stimpson is abnormal, being due to 



