CLASSIFICATION OF THE MAIOID CEUSTACEA. 651 



p. 57, pi. iii. fig. a, would seem, fi'om the figure and the position 

 assigned to it by its author, to have the eyes retractile within 

 well-defined orbits, and hence to be referable to the family Maiidae. 

 Except as regards^the orbital characters, the species figured {I)e- 

 Jiaanius acanthopus) altogether resembles the S. -African Acan- 

 thonyx dentatus, M.-Edw. Perhaps there is some error in 

 M'Leay's delineation of the species in question.) 



Subfamily 4. Microrhynchin^. 



Eyes short and coinpletely retractile ; the postoeular spine or lobe 

 largely developed. Basal antennal joint considerably enlarged throughout 

 its length (except in some DoclecB). Prseocular spine short or absent. 



The rostrum is simple or more or less bifurcated. Carapace more or 

 less triangular and convex. The merus joint of the outer maxillipedes 

 cordiform, or truncated at its distal extremity. Legs usually rather slender. 

 Postabdomen of male and female 6- to 7-jointed. 



This group is altogether intermediate in the structure of the 

 orbital and antennal region between the Inachidse and the Maiidte. 

 The genus Loxorhynclms, for example, closely approaches in these 

 respects Pisa and its allies ; but the upper orbital margin is not 

 dereloped as in the genera of that section of Maiidae. Of most 

 of the genera I have seen no specimens. 



§ 'Rostrum simple. No prceocular spine. 

 * MiCKOBHTNCHUs, Bell (? Solacia, M.-Edwards & Lucas). 

 Carapace broadly triangular. Eostrum very short. Merus joint 

 of outer maxillipedes somewhat cordiform. Anterior legs in male 

 small. Ambulatory legs of moderate length. Type Microrliyn- 

 clms (]il}bosus, Bell. 



*Apiomaia, v. Martens {Pyromaia, Stimpson). Carapace some- 

 what pyriform. Merus joint of outer maxillipedes witli the (jt 

 antero -internal lobe strongly projecting. The rest nearly as in 

 Microrliynclms. Type Apiomaia cuspidata (Stimpson). 



*EsoPUS, A. mine-Edioards. Carapace elongate-oval, convex. 

 Eront rounded at its distal end. Outer maxillipedes with the 

 merus joint slightly prodiTced at its antero -lateral angle. Type 

 Esopus crassics, A. M.-Edwards. 



§§ jRostrtmi lifid or emarginate. A prceocular spine usually 

 present. 



LoxoEHTNCHTJS, Stimpson, Eostrum slightly deflesed, bifid ; 



