ON THE BRACHYUROUS DECAPODS OF THE CAPE. 57 



Sp. 1. ( ) Antilibinia Smithli, n. s. 



Descb, Antilibinia testag margine lateral! antic^ tridentato, clypeo bifurcato cornubvis intus 

 pilosis. 



Note. The shell of this species is without hairs, almost circular, and has the regions in general 

 distinct. The clypeus is bifurcated with a tooth on each side of the base. The anterior lateral 

 margin of the shell has three teeth, of which the foremost is situated behind the eyes ; the 

 second or middle tooth is the greatest, and directed forwards, while the last is little more 

 than a tubercle. The digestive region has an eminence marked on each side. The branchial 

 region has five or more tubercles on each side. The cardial region has a tubercle in the middle 

 behind, and on each side of it there is an oblique portion of the shell scabrose. The horns of 

 the clypeus are pilose on the inside. The digits of the clielee have seven or more teeth on the 

 inside. The four pair of hind feet have their third joints thick, and are armed with long curved 

 claws. This crab resembles the Lihinia spinosa of Milne Edwards so closely, that at first sight 

 it might be taken for it. 



Sub-genus. Acanthonyx, Lat. 



Sp. 2. ( ) Acanthonyx dentatus, M. E. 



Acantlionyx dentatus^ Hist. Nat. des Crust, vol, i. p. 343. 



Sp. 3. ( ) Acanthonyx scutellatus, n. s. 



Descb. Acanthonyx fere dupio longior quam latus, orbitse angulo externo unidentato, clypeo 

 ad basin tuberculis duobus setiferis supra instructo, testse margine laterali bidentato dente 

 posteriori minimo apice subsetifero. 



Note. The shell of this fine species, which is more than an inch long, is shaped like an heraldic 

 shield. It is depressed. The two horns of the clypeus are pilose at their apex, and have two 

 setiferous tubercles at their base. On each side of these horns, and at the external angle of 

 the orbits, there is a triangular tooth also pilose at the apex. The anterior lateral margins of 

 the shell are bidentated. The fore teeth on each side are large, triangular, and blunt. From 

 their points the sides of the carapace proceed towards the posterior margin, nearly parallel 

 to each other, until they arrive at the second tooth, which is rudimentary, and reduced to a 

 setiferous tubercle. The posterior margin of the thorax is rounded. 



Fam. MITHRACID^, Mihi. 



Sub-genus. Dehaanius, M'L. 

 CephalotJiorax subtriangular, with the lateral margins in front dentated, and behind rounded ; 



the clypeus being quadridentate. 

 Orbit simple, with globose moveable eyes, thicker than their peduncles. 



Exterior antennce with the basilar joint broad at the base, then narrower and reaching the 

 middle of the clypeus ; while the second joint is shorter and obconical. 



Internal antennce with the basilar joint subcylindrical, and the second subtriangular. 



External pedipalpi with the outer palpus falciform, and the inner palpus having its second joint 

 with subparallel sides, the third joint sub-quadrate, emarginate at the apex, with the 

 tigellus conspicuous, inserted at its inner angle. 



