CLASSIFICATION OF CRUSTACEA. 



1419 



Subclassis V. ROTATORIA. 



Corpus minutum, pedibus totis carens et ciliis motum. Ab- 

 domen sagpe 2-3 annulatum et apice furcatum, interdum 

 obsoletuni. Annuli cephalothoracis cephalici numero quin- 

 que vel quatuor. 



After this exposition of the subclasses, orders, and tribes, of the 

 class Crustacea, here follows 



A SYNOPSIS 



OF THE FAMILIES AND SUBFAMILIES OF THE HIGHER 

 SUBDIVISIONS OF CRUSTACEA. 



Subclassis I. DECAPOD A. 



Ordo I. EUBRANCHIATA. 



Tribus L BRACHYURA. 



Stjbtribus I. MAIOIDEA. 



Legio I. MAIINEA vel Maioidea Ttpica. — Corpus saapissime oblon- 

 gum, saspius antice angustum et rostratuin. Articulus antennarum 

 externarum lmus sub oculo insitis, anteriusque productus, testa 

 externa sine sutura coalitus. Pedes forma, normales.* 



* We have modified the arrangement of the Maioidea, by separating from the family 

 Maiadae, the families Inachidce and Miihracidce. The peculiarity of the outer maxilli- 

 peds, adopted by De Haan as the characteristic of the Inachidae, appears to be of suffi- 

 cient value to authorize the separation of the genera of this kind from the other Maiidse, 

 although not so important as to require the union of the Eurypodii with the Inachidse, 

 as done by this author. The Mithraces have a distinct character, removing them from 

 the other Maioids. There is in the species Mithrax, a singular diversity of form 



