56 



ON THE BRACHYUROUS DECAPODS OF THE CAPE. 



china, which, as well as the Parthenopina, have the genital organs of the male hollowed out in 

 the first joint of the hind feet. 



Stirps INACHINA, or Triangular Crabs. 



Normal Groupe. (\ Inachid^, M'L. 



Macropodije, M. E. 



Feet long and slender. 



Aberrant Groupe. 



MxiM, M. E. 

 Feet of the ordinary size. 



2 EURYPODID^, M'L. 



(2, EPIALTID.9S, M'L. 



4 MiTHRACIDiE, M'L. 



5 HuENiD^, M'L. 



r Tigellus of external pedipalps inserted at tlie outer angle of 

 I their third joint. 



fTigellus of external pedipalps inserted at the inner angle of 

 1^ their third joint. 



Eyes not concealable ; no orbitary groove. 

 fEyes concealable in an orbitary groove. Clypeus bifur- 

 ^ cate in the middle. 



Eyes concealable in an orbitary groove. Clypeus pointed 

 in the middle. 



5. Of the two first families I have no species from the Cape to describe. I proceed therefore 

 to the third 



Fam. EPIALTID^, Mihi. 



Sub-genus. Antilibinia, M'L. 



Cephalothorax short, convex, pear-shaped, as broad almost as long, with the sides dentated in 

 front, and the clypeus short, triangular, with a bidentated apex, having a smaller tooth 

 on each side. 



Orbit without any distinct fossula. 



Eyes minute, somewhat prominent, but scarcely moveable, and having a very short peduncle. 

 Exterior antennce longer than the clypeus, with their first joint reaching its middle, and being 



three-sided at the apex, while the second and third joints are cylindrical, and the rest are 



short and setaceous. 



Internal antennce inserted at the base of the rostrum, and having their basilar joint obconical 



and rather three-sided, while their second joint is shorter and cylindrical. 

 External pedipalpi, or fifth pair of maxillae, with their outer palpus semifusiform, and the inner 



palpus having the second joint elongated with parallel sides, the third joint subquadrate, 



and the tigellus very small, inserted at its inner angle. 

 Feet, first pair twice as long as body, with the chelse thick, having subacute digits, which are 



serrulated on the inside. The hinder pairs of feet are more slender. 

 Abdomen wanting in my specimen, which is a male. 



This groupe I have called Antilibinia, because it is in the family EpialtidcE exactly what 

 Libinia is in the family Mithracidce. It is only analogous to Libinia, for it has no grooves or 

 orbit for the concealment of the eyes, which besides are neither moveable nor retractile. Libinia 

 is a groupe peculiar to the New World ; but whether it and Antilibinia are sub-genera, or only 

 sections of sub-genera, remains to be proved. 



