Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 75. The regular case-ending of the Accusative singular of i- stems (M. or F.) would be -im: as, sitis , sitim (cf. stella , -am; servus , -um); but in most nouns this is changed to -em (following the consonant declension).

[*] a. The accusative in -im is found exclusively—

1. In Greek nouns and in names of rivers.
2. In būris , cucumis , rāvis , sitis , tussis , vīs .
3. In adverbs in -tim (being accusative of nouns in -tis), as, partim; and in amussim.

[*] b. The accusative in -im is found sometimes in febris , puppis , restis , turris , secūris , sēmentis , and rarely in many other words.