CLASSIFICATION OF THE MAIOID CRUSTACEA. 



651 



p. 57, pi. iii. fig. a, would seem, from the figure and tlie 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 tlie orbital characters, the species figured {^De- 

 haaniiis acantliopus) altogether resembles the S. -African Acan- 

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

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



Subfamily 4. Microrhynchin^. 



Eyes short and completely retractile ; the postocular spine or lobe 

 largely developed. Basal antennal joint considerably enlarged throughont 

 its length (except in some Doclece). Prreocular 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 Inachidae and the Maiidse. 

 The genus Lo.vo7'Jii/nc7ius, for example, closely approaches in these 

 respects Fisa and its allies 5 but the upper orbital margin is not 

 developed a3 in the genera of that section of Maiidae. Of most 

 of the genera I have seen no specimens. 



§ Rostrum simjple. J^o prceocular spine. 



* MiCEOEHYFCHrs, Bell (? Salacia, M. -Edwards & Lucas). 

 Carapace broadly triangular. E-ostrum very short. Merus joint 

 of outer maxillipedes somewhat cordiform. Anterior legs in male 

 small. Ambulatory legs of moderate length. Type Microrhyn- 

 clius f/ihbostis, Bell. 



*Apio:maia, v. Ilartens {Pyromaia, Stimpson). Carapace some- 

 what pyriform. Merus joint of outer maxillipedes with the 

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

 MicrorJiynchus . Type Apioinaia citspidata (Stimpson). 



*EsoPUS, A. Milne-Edwards. Carapace elongate-oval, convex. 

 Eront rounded at its distal end. Outer maxillipedes with the 

 merus joint slightly produced at its antcro -lateral angle. Type 

 Esopus crassus, A. M. -Edwards. 



§§ nostrum lifid or emarginate. Aprceocidar spine usually 

 present. 



LoxoEHTNCnrs, Stimpson. Eostrum Blightly defiexed, bifid ; 



