CLASSIEICATION OS THE MAIOID CRUSTACEA. 637 



one, and has been adopted by nearly all later authors, and consti- 

 tutes the fourth family, Partheuopidse, of the present revision. 

 The genera included in his Macropodiens are, with a few excep- 

 tions (Latreillia, JEgeria, Doclea), included in my subfamilies 

 Leptopodiinse and Inachiina?. The primary sections of his MaVens 

 (il/. cryptoplitlialmes and M. phancrojplithalmes) although somewhat 

 differently chai'acterized, correspond, the former (with the excep- 

 tion ofLibinia, Lissa, MitJirax, and Chorinus) to my family Maiidae; 

 tlie latter, except Pericera, Paramicippa, and Stenocionops, to the 

 subfamily Acanthonychinse of my family Inachidse. 



De Haan, in the fourth decade of his great work '*, divides 

 his family Majacea into five primary groups, or "genera,"!, e. 

 Partlienope, Maja, Pisa, Doclea, and InacJius. The first of these 

 corresponds to my family Parthenopidie, (EtJira being rightly in- 

 cluded and Eurynome omitted from the group. The three fol- 

 lowing are characterized only by the form of the merus joint of 

 the outer maxillipedes (a most variable character) ; and the 

 genera (or " subgenera "as they are designated by De Haan) are 

 grouped together in each without reference to the orbital and 

 antennal characters : consequently these groups are in no degree 

 conterminous with those adopted in the present revision. The 

 fifth, or InacJius group of De Haan, includes those genera which 

 are characterized by the articulation of the merus joint of the 

 outer maxillipedes with the next at its summit instead of its 

 antero-internal angle. This is a far more natural section ; yet the 

 rigid application of this character would now necessitate the 

 separation of genera very closely allied in other respects, as Dana 

 has shown in the case of Eurypoclius and Oregonia ; and other 

 instances might be given. 



In Dana's arrangement of the Maioideaf, three legions or 

 primary sections are established. The first (Maiinea) corresponds 

 to the Macropodiens and Mai'ens of M.-Edwards, and is divided 

 into five families ; the second (Parthenopinea) corresponds to 

 M.-Edwards's Parthenopiens ; and the third (Oncininea) is estab- 

 lished for the single genus Oncinop>us of De Haan. 



The characters of the families of the Maiinea are tabulated as 

 follows :— 



* Crustacea of the ' Fauna Japonica ' of "?. Siebold, p. 77 (1839). 

 t Amer. Journ. of Sci. and Arts (ser. 2), si. p. 425 (1851), and U.S. Explor. 

 Exped. xiii. Crust, i. p. 77 (1852). 



