417. Some substantives, from their meaning, have no singular.

Such are: names of persons of a class: as, #maiōrēs#, _ancestors_;

#superī#, _the beings above_; #mānēs#, _ghosts_; of feasts, sacrifices,

days: as, #Sāturnālia#, _festival of Saturn_; #kalendae#, _first of the

month_; of things made of parts or consisting of a series of acts: as,

#arma#, _arms_; #artūs#, _joints_; #quadrīgae#, _four-in-hand_;

#exsequiae#, _funeral rites_; of some places: as, #Faleriī#; #Vēī#;

#Pompēī#; #Athēnae#, _Athens_; #Alpēs#, _the Alps_.

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