CLASSIFICATION OF CRUSTACEA. 14J9 



SUBCLASSIS V. ROTATORIA. 



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

 domen saepe 2-3 annulatum et apice furcatum, interdum 

 obsoletuin. Annul! cephalotkoracis 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. 



OEDO I. EUBRANCHIATA. 



TRIBUS I. BRACHYURA: 



SuBTKiBusI. MAIOIDEA. 



LEGIO I. MAIINEA vel MAIOIDEA TYPICA. Corpus saepissime oblon- 

 gum, saepius antice angustum et rostratuin. Articulus antennarum 

 externarum Imus sub oculo insitis, anteriusque productus, testa 

 externa sine sutura coalitus. Pedes forma normales.* 



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

 Maiadas, the families Inachidai and Mithracidce. 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 Maiidae, 

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

 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 



