190 SMITHSONIAN MISCELLANEOUS COLLECTIONS 



297. PORCELLANA DISPAR Stimpson 



Plate XXIII, Fig. 3 



Porccllana dispar Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 242 [80], 

 1858. 



Carapax somewhat uneven, but glabrous ; sides pubescent ; lateral 

 margin acute, forming a prominent angle and turning inward a little 

 just behind the lateral notch, and armed with some minute teeth 

 near the middle ; a small tooth or spine above at the insertion of the 

 second joint of the antennae. Orbital margin less concave than in 

 most species. The front, as seen from above, is straight or slightly 

 convex, but in the front view is seen to be acutely sinuated or de- 

 flexed at the middle. Chelipeds very unequal, the greater one with 

 a smooth surface; carpus angular or ridged in the middle and with 

 its anterior margin undulated; hand broad, smooth, not twisted, 

 naked, fingers punctate; dactylus curved, one-toothed within. In 

 the small cheliped the median ridge of the carpus is prominent and 

 its anterior margin bidentate ; the hand is very angular, with median 

 ridge acutely prominent, the outer margin pubescent and the fingers 

 twisted into a vertical plane, much curved, excavated and lanose 

 within. Color in life pale brick-red ; fingers dark purplish. Length 

 of carapax in the male, 0.24 ; breadth, 0.22 ; length of greater hand, 

 0.38; breadth, 0.18; length of smaller hand, 0.29; breadth, o.i inch. 



Found under stones in the fourth subregion of the littoral zone at 

 Garden Island, in Port Jackson, Australia. 



298. PORCELLANA LATIFRONS Stimpson 



Plate XXIII, Fig. 4 



Porcellana latifrons Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 243 [81], 

 1858. 



Carapax subquadrate, longer than broad, slightly convex, smooth ; 

 lateral margins acute, but not projecting, and armed with three or 

 four minute spines near the middle, and a larger spine, very sharp 

 and directed forward, above the insertion of the external antennas. 

 Surface at the frontal region minutely rugate, rugae transverse. 

 Front very broad, projecting, laminiform, trilobate; median lobe 

 largest, quadridentate, and scarcely more projecting than the lateral 

 lobes, which are bidentate; thus the entire frontal margin is eight- 

 toothed ; teeth acute. Eyes large, directed sideways. First joint of 

 external antennae much produced ; flagellum nearly naked. External 



