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Find in the dictionary the plurals of these words:—

I. FROM THE LATIN.

 apparatus

 appendix

 axis

 datum

 erratum

 focus

 formula

 genus

 larva

 medium

 memorandum

 nebula

 radius

 series

 species

 stratum

 terminus

 vertex

II. FROM THE GREEK.

 analysis

 antithesis

 automaton

 basis

 crisis

 ellipsis

 hypothesis

 parenthesis

 phenomenon

 thesis

Anglicized words.

When the foreign words are fully naturalized, they form their plurals in the regular way; as—

 bandits

 cherubs

 dogmas

 encomiums

 enigmas

 focuses

 formulas

 geniuses

 herbariums

 indexes

 seraphs

 apexes

Usage varies in plurals of letters, figures, etc.

54. Letters, figures, etc., form their plurals by adding -s or 's. Words quoted merely as words, without reference to their meaning, also add -s or 's; as, "His 9's (or 9s) look like 7's (or 7s)," "Avoid using too many and's (or ands)," "Change the +'s (or +s) to -'s (or -s)."