G70 MR. E. J. MIEES ON THE 



legs. I propose, then, to refer this genus to the Caucerlnse, where 

 it marks the transition of that group to the Parthenopidae. 



The genus Telmessus of White, which was originally placed by 

 its author among the Plagusiinae and subsequently assigned to 

 the Maiidse (Voy. Samarang, Crust, p. 14) has externally some 

 resemblance to Anaptyelius. In the characters of the orbital and 

 antennal regions, however, it has more affinity with the Cancroid 

 than the Maioid crabs ; and its most natural position is perhaps 

 among the Corystoidea, where Dana placed it.) 



Subfamily 2. EuMEDONiNiE. 



Carapace usually rhomboidal or subpentagonal, with a spine at the 

 junction of the antero-Iateral and postero-lateral angles. Rostrum usually 

 bifid or emarginate. Depressions separating the regions of the carapace 

 obscure or non-existent. Anterior legs of moderate length, not tri- 

 gonous. 



§ Carajpaee flat and smooth above. Ambulatory legs loith all the 

 joints greatly dilated and compressed. 



Zebeida, White. Spines of rostrum and lateral spines of cara- 

 pace large, laminate. Basal antennal joint large and filling the 

 orbital hiatus. Type Zebrida Adamsii, White. 



§§ Carapace uneven or convex. Ambulatory legs slender. 



*Eum:edonus, Milne-Edwards. Carapace depressed. Eostrum 

 long and emarginate at its extremity, where the spines are di- 

 vergent. Anterior legs rather large. Ambulatory legs slightly 

 compressed, with the third joint somewhat cristated. Type 

 Eumedonus niger, Milne-Edwards. 



GrONATOisroTirs, Adams and White. Carapace uneven above. 

 !Rostrum broad, lamellate, rounded, and very slightly emarginate 

 or entire at its distal extremity. Anterior legs of moderate size. 

 Ambulatory legs slender, not dilated and compressed. Type Go- 

 natonotus pentagomcs, Adams and AVhite. 



Ceratocaucinos, Adams and White. Carapace tuberculated 

 above. Eostrum composed of two slender widely separated 

 spines. Auterior, legs of moderate size. Ambulatory legs 

 slender. Type Oeratocarcinus longimanus, Adams and A¥hite. 



In this remarkable genus, the iuner orbital hiatus is completely 



