The foreign plural of "schemata" is "schemata," as it is already plural in English and remains unchanged in other languages.
Forum---Plural Form Forums,Foreign Plural Form Forumina
The foreign plural of addendum is "addenda."
The foreign plural of "prospectus" is "prospectuses."
Stimuli is already the plural of stimulus.
The foreign plural of agendum is agenda.
Schemata is plural. The singular form is schema.
Schemata is plural. The singular form is schema.
"Schemata" is already plural. The singular is "schema."
The plural form of apparatus is apparatuses. It has no foreign plural.
Forum---Plural Form Forums,Foreign Plural Form Forumina
The foreign plural of addendum is "addenda."
The foreign plural of "prospectus" is "prospectuses."
Well, the English Plural is momentums and the Foreign Plural is momenta!
Stimuli is already the plural of stimulus.
The foreign plural of agendum is agenda.
The foreign plural of "madame" is "mesdames."
The foreign plural of criterion is "criteria."