comitia centuriata were assemblies of the various centuries into which the six classes of the people were divided.
By this rally of the Optimates the comitia is dissolved, the senate summoned.
On the nundinæ and the next day no comitia and no meeting of the senate could be held.
The comitia Tributa were properly the council of the Roman people.
What Herennius proposed was that it should take place by a regular lex, passed by the comitia tributa.
As to the comitia, the people had there only a feeble influence.
They voted by Centuries, and were hence called the comitia Centuriata.
Now you have still the comitia by centuries, and the comitia by tribes.
The dictatorship was also a lever left in the hands of the nobility to overthrow oppositions and influence the comitia.
As for the comitia by curi, they are observed only for the auspices.